I used to have 5 in a 75g.. four of them turned on the smallest Anthia and started beating her up until it died. Now I only have four and they are doing pretty well. All of them won't eat NLS pellets, but they do eat F1 flakes and mysis.. I think they are somewhat picky when it comes to food, but not as picky as other Anthias. Either way you'll love them!