This question can't accurately be answered. Individual fish are like any other animal and have varying personalities. You could narrow it sown to size. Umbees and doviis are very large fish and have an obvious advantage over other fish. Managuenses are slightly smaller and are also aggressive. The next bracket would have jack dempseys and green terrors which are very aggressive and tough for their size. You couldn't compare a convict per se with a full grown umbee. You have to narrow it down in size. The most aggressive convict most likely will rum away from a Dovii five times its size. I have 2 jack dempseys (which are sometimes more passive) and the won't put up with any other fish besides my catfish which does what he wants lol hope I helped!