Keeping groups of chromis

Anyone keeping a group of 6+ chromis? I have gotten chromis in the past and they never did well. Whether they weren't in good shape from shipping/collecting process or I didn't acclimate properly, I would start off with 7-9 and gradually lose them. I thought these were pretty hearty fish, and all other tank inhabitants were doing great. Any tips? In the past I would acclimate by floating the bag and switching out the water for tank water about half a cup at a time. Lately I've been using drip method. Would like to have a small group in my 75.


Thanks!