My 20-gallon tank has 13 fish. Can I add more without overcrowding?

Question

We recently bought a 20 gallon fish tank for our house. The tank is currently only holding 16 gallons of water. We currently have 11 fish and 2 snails in the aquarium, totaling to 16 inches of fish (if you count the snails as fish). That’s following the gallon per inch of fish rule. However, my family wants to add more fish. Would we be safe to add more fish or should we stick with the 13 fish we have?

Angel Alvarado, LVT · Accepted Answer

Adding more fish would likely cause overcrowding. This, in turn, could lead to stress, illness and aggression. You are probably at or very close to maximum capacity, especially if you have fish that are still growing.

My 20-gallon tank has 13 fish. Can I add more without overcrowding?

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