Yeah that's definitely too small for all of those fish. 3 fish didnt do well they died remember. The rule is typically 1 inch of fish per gallon. You can have more but will have to do water changes more often, but please dont torture the fish by overcrowding. Imagine if you could only live in your bathroom for the rest of your life.
I don't know why they sell a tank so small. I have a 10 gallon tank with 6 fish and its temporary. When they reach full size( 2 inches) the tank will be too small.
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