I was thinking about adding a single green chromis to my well established 26gal FOWLR tank. Only other fish are a pair of O. clowns that are long time residents. Would the green chromis do well in this set up or are they better kept in groups?
I have had one for several months now without issue. There where 3 but one died in QT. The other went crazy trying to get all the food when I fed the tank and ran full speed into the glass and killed itself. I have been scared to add another so I say yes one will do fine.
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I also think that having more than 2 is a good idea. I have 3 and they are really outgoing. My friend has a single one and he is very shy. I had heard that an odd number is best also, but I think that mainly means that you don't want to have just 2 because of the liklihood of aggression. Mine have some occasional "arguments" but no outright battles between them. I also have 2 small false percs and they do fine with the chromies. They were introduced to the tank after the chromies though, so not the exact same situation.