I see those MiniBow 2.5 tanks at the fish store, and I was wondering, what do you keep in those? I know you can use them for a betta, but I've seen them set up at the store with like 5 small fish in them, such as Neon's, and other small skinny fish. Is that ok? Going by the 1 inch rule, if they get to be even 1" a piece, that should be a 5 gallon tank, right? So what you can legitimately put in a 2.5 gallon tank?