I aquired 2 large 6''ish jack dempseys and 3 huge red parrot cichlids from a guy and they lived in a tank with other cichlids. I put them in with a smaller parrot, some yellow labs, a peacock, an elecytric blue hap, a few assorted cichlids, plecos, red tailed cat and some gouramis in a 125. They have not shown any signs of aggresion towards the other fish and every one seems to be getting along.