Is ok to have just one chromis?

[TekCat]

I've read from a bunch of sources that Chromis better do in groups of 3,5,etc... So, my question: is it OK to have just one Chromis in a tank with other fish? Current fishes: pair of false percs and royal gramma.

 

[Black Mammoth]

I suppose it is OK. But it's a schooling fish. In general you should have 5 or more. Your school should be an odd number. They have a tendancy to kill off one of the smaller ones. Those are just general statements.