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If you remember my hypoallergenic cat thread, you know my son's been bugging mom and dad about pets.

So after explaining mom gets sick from smelling cats, he seems to be ok with that, and got enthusiastic with fish.

I was thinking of starting small with a bowl or a 5 gallon tank, but reading it seems the smaller the tank the harder they are to maintain, so I figured I might as well go with the basic 20 gallon tank.

So got a basic tank, filter, heater, etc.

Now I have to decide what fish to put in it.

Any suggestions as to something that will impress a preschooler but be hardy enough to withstand a beginner fish keeper (had some a loooong time ago)?

Maybe something small but a school of them? So they move together and he can watch them?