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That wasn't my intention. My point was, In aquariums some fish will hang out in loose groups occasionally but will often be spread out across the tank. Anthias are probably the best bet. Damselfish may if they don't continually pick off the weakest link. Firefish form pairs as they get older. Cardinalfish are another good option.
None that I have any experience with will keep packed together in a tight group long term.
None that I have any experience with will keep packed together in a tight group long term.