How Many Fish in a 10 Gallon Fish Tank

If you’re looking to stock your 10-gallon aquarium with freshwater fish, you can fit just about any small species in the tank. For example, a ten-gallon fish tank is large enough to hold betta fish, neon tetras, and guppies. 

But keep in mind that you should choose peaceful species for the tank. Bettas are known to be trouble-free, but you should avoid keeping them with aggressive species that can harm each other.

Generally, a 10-gallon fish tank has a water capacity of about 40 liters, it is suitable for keeping 20 small fish under 5cm, or 5 medium-sized fish between 5-10cm.


1 cm long fish should be matched with 1-liter water. This fish-keeping guide is only for reference. However, different fish species have different requirements for oxygen capacity, the same as the fish sizes. Therefore, it is difficult to generalize the stocking density.

If the water plants are abundant, and the water quality is clear, and there is enough dissolved oxygen in the tank, whether, from air stone or water pump, the stocking density can be higher, otherwise, it should be less. The general principle is that it is less rather than more, and it is refined rather than excessive.

If you want a school of goldfish, a ten-gallon aquarium can hold about six. However, you might need to consider the length of each fish separately. The average black skirt tetra is only about two inches long. Therefore, if you want to keep them in a ten-gallon tank, you should keep at least six of the same species, with a total length of 24 inches.



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