Okay to keep rainbow cichlid in a 20 long

[openbook]

My firemouth got mean and chased my rainbow cichlid out of all the hiding spots in my 72 gallon tank. Rainbow's sister died apparently from stress and some fin nipping. I know the 20 gallon is less than ideal but he is eating and showing beautiful coloration now. The rainbow is about 3" long but I don't think hell catch up in size to the firemouth who is about 4". Not sure what to do. I like both fish equally.

[skullduggery1]

I would say that a 20 would be fine for a rainbow cichlid,as I had one in a 20 for four months with a three inch blood parrot.

[openbook]

I may try to reintroduce him if I get some dithers or maybe some other small cichlids. He doesn't seem to happy in the 20 but at least he's safe.