I think Red Devils are tough cichlids but I don't think that they have to be kept alone. I have personally kept a large RD with other large and aggressive cichlids. While there were some ocassional spats, the RD generally got along well with the others. There are other people on this site that have had great success keeping RDs with other cichlids. It all depends on temperment of the individual fish, adequate tank size, and appropriate tankmates.


