i have two red devils. one i grew out and the other i got when he was older. the one i grew out goes with anything. the one i got when he was older was a royal pain. could not keep anything with him. even the other red devil. then one day had a near catastrophe, his tank broke. actually two tanks. him i put in my mbuna tank. was way over crowded but it was midnight and i had no other choice. the next day i noticed that he was the new kid on the block and the chippokae was still ruler. got a new tank for him and set it up. in the meantime he stayed with the overcrowded mbuna tank. when i did put him in a new tank about two weeks later, he had calmed down considerably. keeping him well fed and in an overcrowded tank seem to make him less aggressive. convicts are good, they are small enough to have hiding places too small for the devil, and provide food from the numerous fry that they produce. he was so bad that he had bit me on several occassions. quite deep also. now i can put my hand in the tank and he does not come after me. knock on wood.
if you want to match the temperament f the devil, the ocscar and dempsey imo are not going to cut it. go for the managuense, jaguar or dovii. make sure that you do not put any fish in the tank that can fit in his mouth, he will eat it.
maggie