the green terror isnt in the 60g, he's alone. i've also read that the pike gets only about 6''-7'' max and he dwells on the bottoms, i also have lots of caves and such for the african/pike to hide in. The african has been digging up a lot of tunnels lately. Oscar will probably live as a mid swimming so i don't think there will be a problem anymore since the aggression has stopped. I guess the dominate fish has been decided for now