A group of chromis can be done. I had a group of 5 for three years or more that grew from tiny dudes to great big lunkers. They started out in a 35 hex, got moved to a 125 for several months and then eventually landed in a 110 where they lived until I tried rice as a means of carbon dosing. The rice caused a bacterial bloom that killed most of the fish in my tank. Moral = chromis in groups is very achievable with plenty of food. I also believe strong current helps to keep them more occupied.
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