Chromis seem to "unschool" when they get used to your tank. I've had good luck with glass cardinals (the ones with bit of purple on their eye area)....they've stayed in school formation in my tank.
I have a school of 5 Chalk Bass and I think they are pretty cool. Nice addition and they never fight or bug each other. They really stick together. My brother has about 12 of them in his tank (2 years) and they are even cooler in bigger numbers like that. Stay about 2-2.5", so not too big.
if you get bangaii cardinals... make SURE they are tank raised... they are on the red list now to be put on the endangered species within 1-2 yrs now due to overcollecting.
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