cute little guy, just surprised to see them that small unless your bread them yourself. I can't find a place that will buy my clowns until they reach 3/4"-1"
I bought them from neptune aquatics... They are tiny little guys.
I'd suggest keeping them partitioned off from any pumps/overflows/drains for a couple of months. They are much too small.
Put a couple pieces of PVC in there at least..so they can hide. I mean..at least..