Also consider the "effect" you would like. I prefer to see LOADS of fish. So I always select varities which, when adults, are still quite small. That way I can keep more of them. Some people prefer 3 or 4 larger fish.
I would go with varieties of tetras: neons, black neons, serpaes and pristellas. But tjat's to get the effect I like. These fish are rarely more than an inch as adults; so you could have 7 or 8!
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