a 65 is too small to harbour any more than one chromis imo. theyll pick each other off until there is eventually only one left.
a fish store is a much different situation for any fish situation. in an lfs the tanks are so crowded that fish have so much competition that none of them can even establish any kind of territory. there is also the fact that oftentimes the fish arent left in the tank long enough to show any aggressive behaviour.
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