One will be fine, but I wouldn't try to keep a group in anything smaller than a 180. They can be maintained as a group, but plenty of swimming (and escaping) room is needed to do so.
yeah chromis. i'm still wondering how he's able to keep so many athias if they're so territorial. I love anthias and would love to school them some day..
FWIW, I have a 110gal tank. Among other fish, I have 2 Lyre Tail Anthias and 1 Bartletts Anthias. They all get along great. In fact, the bartletts and the bigger lyretail seem to court each other. I haven't witnessed anything territorial.
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