I wouldn't say keeping them well fed keeps there aggression down, but it definitely stops them from trying to eat tankmates IME. I also read a thread that was old though at that time and that was some time ago where it was said one of the two was more aggressive towards the keeper but less aggressive towards othe fish and vice versa, the validity of this I've no clue of as it was only mentioned once and I believe by jelly. That can just be a case to case thing. I'd say for the key factors, the Aimara shouldn't necessarily be smaller, I feel that can go one of two ways, it can make the fish intimidated and run, or intimidated and retaliate. But I'd say the same size as your other wolves would be good. Fish should be well fed regardless if behavior, and that's doesn't mean over fed or under fed. I feed my curu once every two days for example, and she/he would look pregnant kind of for a day or so and then the second day he/she is ready to eat again. A large tank of course attributes to what you can get away with, and amount of fishes kind of, dither/target fish can help, but those would be something faster than cichlids.. Typically a shoaling species as well, i.e. Tinfoil barbs, bala Sharks, silver dollars etc.
