How many fish in a 36 gallon aquarium

Gallons = Length (inches) × Width (inches) × Height (inches) × 0.004329. Calculate the Gallons: Simply multiply the values according to the formula to get the total gallons your aquarium can hold. Interpret the Result: The calculated value represents the total capacity of your aquarium in gallons. This information is crucial for various ...

Additionally, overfeeding increases waste excretion by aquarium fish, snails, crabs, etc. For example, a high rate of feeding equals more fish poop, and more wastes will result in high nitrites. ... I have a 36 gallon tank with 28 fish in the tank, i have a combination of neon tetras (12), black tetras (3), 2 angel fish, 4 glo fish, 2 red ...I will say that 60 gallons (my tank size also) is pretty small when it comes to saltwater fish. I have had to think and rethink my choice in fish several times. I am currently at 6 fish and thinking that I am near capacity. All six are smaller sized fish (clownfish and wrasse).A 10 gallon tank is a great starter tank size for beginners. One thing you should know is that when stocking small sized tanks, it is important to not go overboard, and always try to keep some legroom for the fishes. You can safely put in one to three glofish in a 10 gallon tank.Generally, the rule of thumb most hobbyists are familiar with is for every 1 inch of fish per gallon of water. For example, that means is if you have 2 inches of fish you need 2 gallons of water. However, this is just a guideline as there can be exceptions to this rule, so it is important to understand what can influence these exceptions.Swordtail fish are popular freshwater aquarium fish known for their unique tail fin shape and vibrant colors. They thrive in well-maintained aquariums with a temperature range of 65-82°F (18-28°C) and a pH between 7.0 and 8.3. ... How many Swordtail Fish in a 20-gallon tank? ... August 10, 2019 at 8:36 am We have 7 to say tetra , 2 small ...The “size” of a fish tank refers to how many gallons the tank will hold. Tanks range from small to gigantic aquarium size. A household tank usually runs from 5 gallons to 155 gallons. ... 30-Gallon aquariums are an even better option for a single goldfish or for two small goldfish. While they are small, two goldfish may do well in this size ...You can easily put up to four Amano shrimp, six cherry shrimp, or six ghost shrimp in a 3-gallon tank. That being said, here are some details about six good stocking ideas for a 3-gallon tank: 1. Betta fish. by PixieLiv. We all love bettas because of their bright colors and long flowing fins.

Aquarium Substrate Weight Calculator. To use this calculator, enter the size of your aquarium and the desired depth of the substrate. The substrate weight will be calculated for you. Width of Tank inches. Length of Tank inches. Inches of Substrate. Gravel Required: lbs. Dry Sand Required: lbs. Wet Sand Required: lbs.Most freshwater, tropical and marine aquarium fish eat shrimp, and many commercial foods contain dried shrimp and shrimp by-products. The labels on commercial food for home aquariu...how many blood parrot cichlids can i have in a 36 gallon bowfront? None. The fish will grow too large for that tank. you may keep up to5 or 6 really as babies but they do eventually get to a size to where even two or 3 would be to many. they grow to about 8 inch but also look like softballs. the thing is is that most of the time these fish tend ...Aquarium Shape; 50 Gallon: 36.375 x 18.375 x 19: Standard Rectangular: 55 Gallon: 48.25 x 12.75 x 21: Standard Rectangular: 60 Gallon: 48.375 x 12.875 x 23.875: Standard Rectangular: ... Fish aquarium dimension in feet 9*6*2(L*W*H) in ceiling how much water in use & How many fish stay there &Which types of fish pls halp for cafe. …Betta Fish. Betta fish are the quintessential “Small Space” species. These fancy fish do not require massive aquariums to stay healthy. In fact, they’re used to shallow and cramped environments (which makes them one of the best fish for 5 gallon tanks). Bettas are native to rice paddies in Southeast Asia.The one-inch-per-gallon rule is an easy way to calculate how many fish you can stock in your aquarium. It considers the size of the aquarium and recommends one inch of adult fish for every gallon of water. Therefore, if you are wondering how many fish you can have in a ten-gallon tank, this rule tells us you can stock ten fish that grow to an ...

A Common Pleco needs at least 75 gallons, they can get to 18 to 24 inches in length, heavy in the body and produces huge amounts of waste. The Oscar needs a big tank also, mine was 14 inches long, heavy in the body and the tank she was in was just too small for her.Standard Size: 72″ x 18″ x 21″. A average 125-gallon aquarium has a capacity of 568.261 Liter a 125-gallon fish tank is around 8 feet in length and 2 feet in breadth. This tank can accommodate adult-sized aquariums since it has a volume of 23 cubic meters for adult-sized balloons. As an example, a typical goldfish bowl has a volume of ...Using the dimensions for a 125-gallon aquarium simply multiply the numbers together and divide by 231. 72 x 19 x 21 = 28,728 / 231 = 124.36 gallons. Regardless of the aquarium size, you can use this formula to calculate volume. A 125-gallon aquarium has dimensions of 72″ long x 19″ wide x 21″ tall. measuringstuff.com.May 4, 2023 · Generally speaking, for a 40 gallon tank with a plain or rectangular shape and an average sized fish population (2-3 inches per adult fish), 1 – 2 pounds of gravel per gallon is recommended. This means that for your 40 gallon tank, approximately 40 – 80 lbs. of gravel should do just fine.

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23 1⁄4 x 20 3⁄16 x 24 3⁄4. 390 lbs. 60 Gallon Hexagon. 27 1⁄4 x 24 1 ⁄ 8 x 29 1⁄2. 750 lbs. Measurements are LxWxH. Length and width are both measured from the flat panels and not from the corners. There are many other variations and sizes of the hexagon aquarium but most are custom made and their measurements will vary.When it comes to stocking a fish tank, there are some general guidelines to follow. One crucial factor is the size of the tank. For a 5-gallon tank, it is important to consider the limited space available. As a general rule, experts suggest having no more than one inch of fish per gallon of water. This means that in a 5-gallon tank, you should ...Best Fish For A 36 Gallon Tank. There are lots of fish to choose from when setting up a new tank. While it is exciting, its important to know which fish can work and which fish can't. This list will go over the best fish for a 36 gallon tank and provide some basic care information. 1. Dwarf Gourami. Dwarf Gouramis are one of the best ...Tokyo's enchanting fish art exhibition uses over 5,000 goldfish. One of Tokyo’s most popular summer attractions features LED light displays, impressive glass sculptures, an immersi...

A 10 gallon tank is a great starter tank size for beginners. One thing you should know is that when stocking small sized tanks, it is important to not go overboard, and always try to keep some legroom for the fishes. You can safely put in one to three glofish in a 10 gallon tank.In this comprehensive guide, we’ll explore the top fish species that are well-suited for a 36-gallon bow front aquarium. Whether you’re a beginner or an experienced hobbyist, we’ve got you covered with valuable insights, expert tips, and everything you need to know to create a thriving aquatic ecosystem.When deciding how many fish to put in an aquarium, you should consider the size and activity level of the fish, the amount of waste they create, and their compatibility with others. Though it’s common to hear about the one-inch-per-gallon rule, this misses the important factors mentioned.9 years ago. For your 36 gallon you could get a pair of angels, or just one angel, guppies, mollies, platys, Endlers, cory catfish, tetras, rams, and more. If you want to set a planted tank would you want high or low? Some low light plants are anubias, java moss, hornwort, java fern, crypts, amazon sword, and more.70-gallon tanks can hold 35 guppies. 75-gallon tanks can hold 36 to 38 guppies. As you can see, the number of guppies you can house in a fish tank depends on the size of the tank. Smaller tanks can hold one to two guppies, medium-sized tanks can handle five to six, and larger tanks usually accommodate a maximum of 30 to 40 guppies at one time.But remember, this rule is more like a pirate's code—more what you'd call "guidelines" than actual rules. In reality, the number of fish you can comfortably house in a 30-gallon tank depends on factors like the species of fish, their adult size, behavior, and activity level. So, you could be looking at anywhere from 15 to 30 small ...As a rule of thumb, you'll need one pound of gravel per gallon of water. For example, if you put 10 pounds of gravel in a 10-gallon tank, you'll get a one- or two-inch-deep substrate. If you want to know the exact amount, measure the dimensions of your aquarium. Then, multiply the tank's length by its width, and divide the answer by 10.4- Goldfish. The Goldfish is hardy, long-lived, and active. The common goldfish can grow to 12-14 inches (30-35 cm) in length, but generally, they don't get bigger than 8 inches (20 cm). Fancy varieties are much smaller, about 2-4 inches (5-10 cm). You can keep a 3-inch Goldfish in your 1 gallon tank.A 36 gallon bow front aquarium is a great choice for fish enthusiasts. They are deep and spacious, making them ideal for a wide variety of fish. But what about the …Saltwater. 1.82 liters/min. 1.45 liters/min. 2.27 liters/min. The optimal size air pump for a 55 gallon aquarium is one that can output 1.82 liters/min. If you have a planted 55 gallon aquarium, then an air pump with an output of 1.45 liters/min will suffice.Buy a rectangular 55 gallon tank. It gives the fish maximum movement area so you can enjoy them swimming. If you are really into it a 110 gallon tank but beware YOU WILL NEED A HEAVY SUPPORT PLATFORM for the 110 Gal tank because it will weigh nearly 925-950 lbs. I put my 55 gallon tank (540 lbs) on an old dresser.

Here is a list of the smallest tangs as fully-grown adult fish: Bristletooth Tomini Tang, with 6-inches as a fully-grown adult, is the smallest tang fish. SquareTail Bristletooth Tang: 6.5 inches. Yellow Eye Kole: Fully grown adult size: 7-inches. Two-spot bristle tooth: 8 inches.

Our Aquarium Stocking Calculator can be used as a guide to help you work out how many fish you can keep in a tropical freshwater, tropical marine, or coldwater aquarium. The store will not work correctly when cookies are disabled. Up to £12 OFF with codes > Up to £12 OFF with codes > ...Here are some good combinations of tetras, other fish, shrimps and snails that can be kept in 5, 10 or 20 gallons tank: 5 gallon/ 19 liters. 5 gallon tanks are small so your choice is pretty much limited. 6 neon tetras + 1 snail OR. 2 platys + 6 ghost shrimps OR. 1 beta + 6 ghost shrimps or 1 snail. 10 gallon/ 35 liters.A standard 30 gallon fish tank will measure 36″x13″x16″. However the exact dimensions will depend on the shape and brand you pick. Breeder tanks usually have a different width and height to help create a squarer base which is needed for breeding. These 30 gallon breeder tanks usually measure 36″x18″x12″.How Many Saltwater Fish Can I Put In A 75 Gallon Tank? ... Tetra Complete LED Aquarium 10 Gallons, Includes LED Lighting, Filtration and Accessories . Check Latest Price. Bestseller No. 2. …Dec 3, 2011 · 28 posts · Joined 2011. #7 · Dec 13, 2011. You could easily keep 3 angelfish, right through adulthood in a 36 gal tank. In fact I have done this many times, in many tanks, with no problem. At any given time, I have more than 2000 angelfish in my fishroom. Only general rule I follow for angels is 10 gallons per adult fish. 35 Peaceful Community Fish For Your Tank (Updated List) by Millie Sheppard. June 8, 2023. 172.9K views. Picking some community fish for your freshwater aquarium can seem a little intimidating at first. With so many options, It's hard to know where to start! The ideal fish you're looking for are peaceful and adequately sized for your planned ...The standard dimensions of a 30-gallon aquarium are typically 36 inches in length, 12 inches in width, and 16 inches in height. To calculate the volume of the tank in gallons, you can use the formula: length x width x height ÷ 231. For a 30-gallon tank with dimensions of 36″ x 12″ x 16″, the calculation would be as follows:

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The 40-gallon breeder tank measures 36” x 18” x 16” and weighs roughly around 55 lbs to 58 lbs. The 40 gallons will have a filled weight of 458 lbs. The 40-gallon breeder is the ideal size when it comes to breeding tanks. The fact is many fishes tend to get protective and pretty territorial during breeding, so the more space you provide ...The 29-gallon fish tank is also a step up in height, which is great for growing a variety of aquarium plants. This aquarium size is also great as a hospital or quarantine tank for medium and larger fish. Dimensions: (L x W x H): 30 x 12 x 18 inches or 76 x 30 x 46 centimeters. Dry Weight: 40 pounds or 18 kilograms.4 Oct 2019 ... 36 Gallon Bow Front Aquarium. Aquatic Beast•13K views · 11:13 ... How MANY FISH Can You Put In Your Aquarium? ... Aquarium Keeper | 36 Gallon Fish ...Let’s break down the various factors influencing the maximum number of fish you can keep in an aquarium. Tank Size (gallons): 10 – 5-7 small fishes or 3-4 medium fishes. 20 – 10 small fishes or 6-8 medium fishes …For proper schooling, you can keep 5 to 6 Angelfish together in a tank. Remember, each Angelfish require almost 10 gallons tank. So, analyze their existing number while keeping them together in an aquarium. With this saying, a whole Angelfish group is fit to stay together in an 80-gallon tank size.How many angelfish can I put in a 36 gallon bow front? ... r/Aquariums • 5.5 gallon cube just planted, any advice or options for stocking? ... Hey guys. I decided to get me a betta for my 15 gallon tank center piece fish and was wondering what tank makes you guys recommend? Thanks. r/Aquariums ...Generally speaking, you should add about 1 pound of substrate per gallon of water. This means that for a 5-gallon fish tank, a safe bet would be 5 pounds of gravel. Similarly, for a 20-gallon fish tank, roughly 20 pounds of gravel would suffice.Apr 7, 2021 · The standard size of a rectangular 40 gallon aquarium is 36″x13″x20″. Long 40 gallon varieties will be 48″x12″x16″. A 40 gallon breeder tank dimensions will be 36″x18″x16″. Just make sure to double check your specific tank though because dimensions can vary slightly depending on the manufacturer. Although these fish will do better in a larger aquarium, 5 gallons is about their minimum tank size. A small group of about 4 of these fish can be kept in 5-gallon fish tanks with good filtration and regular maintenance. This is another fish where a heater is not necessary. 5. Scarlet BadisIn this comprehensive guide, we’ll explore the top fish species that are well-suited for a 36-gallon bow front aquarium. Whether you’re a beginner or an experienced hobbyist, we’ve got you covered with valuable insights, expert tips, and everything you need to know to create a thriving aquatic ecosystem.May 7, 2023 · How Many Fish Can I Put in a 36 Gallon Tank? When considering how many fish you can put in a 36 gallon tank, it is important to remember that the size of each individual fish should be taken into consideration. Generally speaking, a good rule of thumb when stocking an aquarium is to allow 1 inch of length for each gallon of water. ….

One of the biggest mistakes that people make with tropical fish is overcrowding their tank. As a general rule, the calculation for how many fish can go into your tank is 1 inch of adult fish per 1 gallon of water, making sure to take 10% of water off for gravel, decorations etc. Territorial species of fish will need double the space, so 1 inch of fish per 2 gallons of water.As a general rule, for small fish, you can calculate one inch of fish per gallon of water. For example, if you have a ten-gallon tank, you can keep ten one-inch fish. But for larger fish, it is recommended to allocate at least two gallons of water for every inch of fish. So, if you have a 50-gallon tank, you can keep five 10-inch fish.Generally speaking, for a 40 gallon tank with a plain or rectangular shape and an average sized fish population (2-3 inches per adult fish), 1 – 2 pounds of gravel per gallon is recommended. This means that for your 40 gallon tank, approximately 40 – 80 lbs. of gravel should do just fine.The 40-gallon breeder tank measures 36” x 18” x 16” and weighs roughly around 55 lbs to 58 lbs. The 40 gallons will have a filled weight of 458 lbs. The 40-gallon breeder is the ideal size when it comes to breeding tanks. The fact is many fishes tend to get protective and pretty territorial during breeding, so the more space you provide ...How many fish in your aquarium can be calculated by using several tools, including an aquarium stocking calculator and aquarium bioload calculator. Basically, you need to know the correct fish-to-tank …The friendliest place on the web for anyone with an interest in aquariums or fish keeping! If you have answers, please help by responding to the unanswered posts. See posts with no answers. Aug 19, 2011 #1 I. iaml0st815 Aquarium Advice Newbie. Joined Mar 8, 2011 Messages 4. I've got a 36 gallon bow front aquarium that is going to be species ...Don't use power heads, use circulation pumps. Just mount them mid to upper level and point them slightly towards the surface. With a 36, you can also run a HOB filter and put chemi pure elite along with a puri pad in it with no other filter media. With the Blenny, be warned, they are not easy to keep and get to eat.The traditional method for working out how many fish you can keep in your fish tank is "one inch of fish per one gallon of water.". However, that method is flawed, as it doesn't take into account the requirements and behaviors of individual fish species. For example, some fish are highly territorial and won't tolerate a crowded tank ... How many fish in a 36 gallon aquarium, Now that we’ve explored the key features, let’s discuss the benefits of choosing the Top Fin 36 Gallon Bow Front Light for your aquarium: 1. Enhanced Aesthetics: ... You can typically put 20-25 small-sized fish or 10-12 medium to large-sized fish in a 75 gallon tank. A 75 gallon tank is considered a good size for intermediate aquarists who ..., When it comes to setting up a 75-gallon aquarium, understanding its dimensions is crucial. The length, width, and height of the tank play a significant role in determining the overall capacity, aesthetic appeal, and suitability for different fish species. Length. The length of a 75-gallon aquarium is an important factor to consider., Filled Weight: 62 lbs. Let us now see the best 5-gallon tanks with pros and cons. best 5 gallon aquarium saltwater-or-freshwater. best fish for a 5 gallon tank. Betta Fish (Betta splendens) : Guppies (Poecilia reticulata) : Molly (Poecilia latipinna/Poecilia sphenops) : Neon Tetras (Paracheirodon innesi) :, If you are wondering how many liters are in a gallon, then the answer is approximately 3.78 liters. Therefore, a 32 gallon saltwater tank would contain approximately 121.13 liters of water. Depending on the type and quantity of fish you plan to house, you may need to add salt to your tank to create a suitable environment for your fish., Number of Fish: 20 Fish Length: 1 in. Recommended Fish for Your Tank. Fancy Guppies. Platies (Mixed) Neon Tetras. How Many Fish per Gallon. The most often quoted “rule” …, Building the DIY aquarium stand . 1. Measure your fish tank. Our own 65 gallon fish tank dimensions: 36″ wide, 18″ deep, 25″ tall. I chose it because it's taller, which gave us a smaller profile to work with because we didn't have space for a longer, shallow tank. 2., When deciding how many fish to put in an aquarium, you should consider the size and activity level of the fish, the amount of waste they create, and their compatibility with others. Though it’s common to hear about the one-inch-per-gallon rule, this misses the important factors mentioned., Hello Everyone!In this video we take a closer look at fish that can go together in a 40 gallon breeder! Want more information on some of the fish featured in..., Rating - 0%. 0 0 0. In my 75 right now (newest fish is at least 6 months in, most are 2+years): 1 one spot foxface. 3 pajama cardinals. 1 firefish goby. 1 diamond watchman goby. 1 black occelaris. 1 lyretail anthis., Fish oil supplements may not improve ADHD symptoms, but there may be other benefits. Research says fish oil supplements do not appear to improve ADHD symptoms. But there may be oth..., Factors That Influence How Many Fish You Can Keep In A 20-Gallon Tank. The “1 inch of fish per gallon of water” guideline is somewhat flawed. But when it comes to stocking a 20-gallon tank with nano fish (up to 3 inches long), it’s actually accurate. This rule of thumb doesn’t apply to larger-bodied fish, as you can’t expect a 15-inch ..., 15 Fish in a 10 Gallon Tank. Having 15 fish in a 10 gallon tank is not recommended because it can lead to overcrowding and stress for the fish. Crowded tanks can also create poor water quality, which can be detrimental to the health of all the fish. To ensure that your fish are living comfortably, it is best to have no more than 1 inch of full ..., How does a fish pedicure work? Find out how you can benefit from a fish pedicure and how it can help your skin. Advertisement Each spring women rush to the spa to get pedicures, so..., 95-120 GPH. 150-195 GPH. A good size filter for a 30 gallon fish tank is one with a flow rate of 120-150 GPH (gallons per hour). If your 30 gallon tank is planted you will need a filter with a flow rate of 95-120 GPH. A 30 gallon reef tank on the other hand will need a filter that has a flow rate of 150-195 GPH., This tank measures 31.5 inches by 13 inches by 59 inches and weighs a heavier 45 pounds. It's constructed out of strong, impact resistant acrylic on the tank itself. It includes this stand and canopy with a built in feeding tube for easy feeding times. It includes a 40 gallon aquarium filter system, a pump, a bio ball, and an air pump., How Many Fish Can I Put in a 36 Gallon Tank? When considering how many fish you can put in a 36 gallon tank, it is important to remember that the size of each individual fish should be taken into consideration. Generally speaking, a good rule of thumb when stocking an aquarium is to allow 1 inch of length for each gallon of water., Going by the numbers, however, you can put up to 8 to 10 fish in a 10-gallon aquarium tank. However, we would not recommend adding 10 fish in a tank unless the fish are tiny and do not generate too much waste. On the other hand, if you have chosen fish types that grow over time, you should limit the number to 8 or 6., 3. How many fish can I keep in a 36 gallon bow front aquarium? The number of fish you can keep in a 36 gallon bow front aquarium varies depending on the size, activity level, and compatibility of the species. As a general guideline, aim for 1 inch of fish per gallon of water., Ideal for danio and tetra glofish. 20-gallon tank. 5-6. 30-gallon tank. Approximately 9. 50-gallon tank. More than 10. Glofish are schooling fish, therefore keeping them in a 5- or 10-gallon tank will lead to overcrowding and ultimately will result in poor health. Also, they can grow up to a maximum length of 2.5"., Perhaps, the easiest fish to take care of in 2.5 gallon fish tank is White Cloud Minnows. It’s small (grows up to a maximum of 1.5 inches) and hardier than most small schooling fish, and can withstand most of the mistakes by novice fish caretakers. The only exception is copper medication., Aquarium substrate is the material used at the bottom of an aquarium, and it can be sand, gravel, or soil, chosen based on the aquarium's theme and purpose. A general guideline is to use 1 pound of substrate per gallon of water volume in the aquarium. For planted tanks, 1-3 inches of substrate or 1-3 pounds per gallon are recommended., The 29-gallon fish tank is also a step up in height, which is great for growing a variety of aquarium plants. This aquarium size is also great as a hospital or quarantine tank for medium and larger fish. Dimensions: (L x W x H): 30 x 12 x 18 inches or 76 x 30 x 46 centimeters. Dry Weight: 40 pounds or 18 kilograms., The 29-gallon fish tank is also a step up in height, which is great for growing a variety of aquarium plants. This aquarium size is also great as a hospital or quarantine tank for medium and larger fish. Dimensions: (L x W x H): 30 x 12 x 18 inches or 76 x 30 x 46 centimeters. Dry Weight: 40 pounds or 18 kilograms., The number of fish that can fit in a 36 gallon tank depends on the types of fish you want to keep and their adult size. It’s recommended to have one inch of fish per gallon of water, but it’s important to take into account the swimming behaviors and territorial tendencies of each species., For a 10-gallon tank, the number of goldfish you can keep depends on the size of the fish. If you want to stock juvenile goldfish or fry, you can keep 3-5 fish in this tank size. However, if you consider keeping adult Goldfish, you can’t keep two of them in a 10-gallon tank. Goldfish grow longer; therefore, they’ll need about 20 gallons to ..., How many fish in your aquarium can be calculated by using several tools, including an aquarium stocking calculator and aquarium bioload calculator. Basically, you need to know the correct fish-to-tank …, How many fish you keep in a fish tank depends on which fish species you choose, and the individual species requirements of each. However, since this is a pretty tiny nano tank, you can keep one larger (up to 2in long) solitary fish in a 5 gallon tank, such as a betta, or you can keep 7-8 tiny schooling fish, depending on the breed.For example, you could keep 7-8 chili rasboras in a 5 gallon tank., 6.5-7.5. How many celestial pearl danios in a 5-gallon tank. 6. Celestial pearl danios (see our care guide by clicking here) are a favorite choice for 5-gallon tanks because they are hardy fish, with minimal tank requirements. They're considered coldwater fish, so you can get away with an unheated tank setup., The best fish for a 29 gallon tank are schooling species such as tetras, barbs, rasboras, and danios. These types of fish do well in groups and require plenty of space to swim around. They also prefer water temperatures between 72-82 degrees Fahrenheit and pH levels between 6.0-7.5. Other good options include Corydoras catfish …, Surface area of a fish tank = length x width. To calculate how many fish you can have using this method is: 1 inch of adult fish for every 12 square inches of water surface area. For wide bodied fish, it is 1 inch of adult fish for every 20 square inches. The greater the surface area of your tank, the more fish you should be able to have., The minimum tank size for two angelfish should be a 20-gallon tank. Two fish should be able to do fine in a 20-gallon tank so long as you aren't putting any other fish in there. However, the fish will be even more comfortable if you choose to give them a larger tank. Many enthusiasts recommend keeping two angelfish in a 29-gallon fish tank or ..., Unlike other aquarium fish, male guppies are smaller than female guppies, so it shouldn't be a problem if you plan to have up to 12 males. For females, keeping 10 or fewer in a 20-gallon fish tank is best. Only Female Guppies. Female guppies range from 1.2 to 2.4 inches in size. A 20-gallon fish tank can hold around 8 to 10 female guppies., As a general rule of thumb, you should allow 1 to 2 gallons of water per inch of fish. Goldfish are very dirty fish, so be careful not to overcrowd your tank. These are highly social fish that need to live in groups to be happy and thrive, and luckily, you can keep three or four goldfish in a 30 to 35-gallon tank.