Treat the green terror like almost any other cichlids. Territorial, aggressive, and with some personality.
I suggest you look at some of the Green Terrors at different stores. Some are so brilliant and have nice fins/tails with more color and varying patterns.
I prefer to try to find one with a larger hump on his head with nice finnage and color. That just means that they are pretty dominant and have been treated well in terms of health in the aquarium.