How Many Fish Should Be In A 20 Gallon Aquarium? | My Aquarium Club

In this article, we present the best 20 gallon fish tanks and 20 gallon aquarium kits.
Photo provided by Flickr
(2.75 – 4 in) need at least a 30 gallon tank to thrive; however, these colorful fish are sometime chosen for 20 gallon tank. They are schooling and aggressive fish so a school of five specimens is recommend for 20 gallon tank without other fish. There are many types of tiger barbs with various of colors for you to choose.
Get 20 gallons (75 liters) at the very minimum and only if you’re keeping one or two goldfish.
Photo provided by Flickr
This steel stand has an A-shaped silhouette in a flared design that has two shelves allowing you to display not only one but two individual fish tanks. Tha aquarium stand measures approximately 28.4 x 18.1 x 5.4 and weighs about 15.5 lbs. It’s a light aquarium stand that allows you to easily move it around while you find the perfect spot for it. However, it is strong and robust enough to hold two fish tanks; a 20 gallon fish tank on top and a 10 gallon fish tank on the lower shelf. The bottom shelf can also be used to hold aquarium accessories instead. It also has a rust-resistant coat so you will not have to worry about any moisture damage. Here's the list of our top 5 choices for centerpiece fish in the 20 to 29 gallon tank range. What's in your top 5?
Photo provided by FlickrJun 3, 2017 - There are many types of fish that can live healthily in a 20 gallon fish tank
Photo provided by FlickrFish I Can Put For A 20 Gallon Tank | My Aquarium Club
Photo provided by Flickr
I want to set up a fish tank. I have one I'm not using... 20 gallon tank with a filter. I want something easy to take care of, but not a betta because they can't live together. Any suggestions, or should I just go talk to the people at the pet store?What I mean by that is you can get 4 fish that are 5 inches wide. Or 10 2 inch fish (though that's probably too many even though it fits the rule). If you go with tetras, I'd get 5-7 in a 20 gallon.“The bigger the aquarium, the easier maintaining it will be.” This is probably the single most important rule in the hobby, and for someone setting up their first aquarium, it is an absolutely essential fact of life. The size of the aquarium has a direct impact on several key physical and chemical processes, including pH stability, thermal stability, and the dilution of metabolic wastes such as ammonia. The smaller the tank, the less stable and the more toxic the environment is likely to be.

The size of the aquarium is also important in terms of how fish behave. Schooling fish need to be kept in groups of at least five or six specimens, and that it turn requires a certain amount of aquarium volume and swimming space. When kept in insufficient numbers, barbs, danios and tetras become frustrated and often turn aggressive or nippy. Territorial fish need to be able to claim a certain patch of ground, and if there isn’t enough space in the tank, fighting or bullying can occur. Livebearers pose a particular set of problems because of the way males fight with each other while also tending to bully the females. It is important that there is enough space for the male and female livebearers to spread out, and if necessary find hiding places where they can rest or give birth safely.
For all practical purposes, the minimum “safe” aquarium size is 20 US gallons (75 litres). Such a tank will be big enough to accommodate a reasonable selection of small aquarium fish without being particularly large or expensive. More ambitious aquarists interested in big or territorial species such as cichlids should consider larger systems though, with tanks up to 55 US gallons (210 litres) in size providing a good balance between size and expense.20-gallon (76 litre) tanks

Tanks this size are ideal starting points for anyone entering the hobby. In the United States 20-gallon tanks are available in “tall” and “long” varieties. The tall tanks measure roughly 24 inches in length and 17 inches in depth; the long tanks are 30 inches in length and 13 inches in depth. All else being equal, the long tank is better. Long tanks offer more swimming space and have a greater surface area to volume ratio, meaning oxygen diffuses into the tank at a faster rate. You can keep more fish, more happily, in a long tank than a tall tank.
Do tall 20-gallon tanks have any advantages? Not many. They are perhaps a bit easier to decorate with tall plants and rocks, and having a smaller footprint they take up less space on a tabletop or shelf. Greater depth does work better with certain small but tall fish, in particular domesticated angelfish. But beyond that, these tanks are far inferior to long tanks for general fishkeeping and are best avoided by less experienced hobbyists.

Species useful in 10-gallon tanks will do even better in a 20-gallon tank. In the case of things like small tetras, you can keep larger groups. If you have a nicely planted aquarium, consider keeping two dozen neons for example. Otherwise some of the additional species you can sensibly keep in a 20-gallon tank include the following: