The ‘biggest’ fish, in my opinion, for a 20-gallon tank would be around 3-inches long fully-grown. Big fish need a big tank – at least 55-gallons but a 70-gallon tank wouldn’t cost you much more. In my opinion, it’s cruel to confine larger fish to such a small aquatic environment, whether they be freshwater or saltwater fish. This size aquarium doesn’t allow enough space for fish of substantial size to swim about freely. To put it simply, ‘big’ fish – which is, by aquarium standards, anything over 4 inches in length – should not be kept in a 20-gallon tank. So, if you’re ready to learn more about stocking a 20-gallon tank and how ‘big’ you can go, then let’s begin! What Big Fish Can Go in a 20-Gallon Tank?
#20 gallon fish tank how to
We’ll learn which freshwater and saltwater species are ideal for a tank this size, if a tank this size is ‘big enough’ for adult fish, and how to tell if your pets have outgrown their tank. Now that you know you can keep fish that are up to 4-inches long – totalling 20-inches overall – in a 20-gallon tank, let’s dive deeper into this topic together. Any fish over 4 inches long, regardless of how many you have, shouldn’t be kept in a 20-gallon tank as they need more space to swim, explore, and forage. Multiple smaller schooling fish like neon tetras or a single larger fish like a fancy betta would do well in a 20-gallon. You can keep up to 20 total inches of fish in a 20-gallon aquarium – the ‘rule of thumb’ for stocking a fish tank is one inch of fish per gallon of water. Therefore, what’s the biggest fish you can put in a 20-gallon tank? The size of a tank typically reflects the size of the fish. In my opinion, a 20-gallon tank is the gateway to larger aquariums down the line. They fit in almost any room and you just can’t beat the price of a tank this size.
20-Gallon tanks are very popular with aquarium hobbyists.
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