Thanks. What you keep with your GT depends a lot on the size of your tank. I only have 2 GT's left. I had to rehome the other 2 due to aggression towards each other. The remaining 2 are kept in separate tanks, a 65 gal. And a 120 gal. Male GT's don't get along together very well. I don't know how agressive your GT is but A lone GT, Rivulatus variety, is not particularly agressive as South American cichlids go. As for tankmates with nice colors, firemouths, salvini, larger Bolivian rams. Big tetras, Columbian, Buenos Aries or maculatus "spotted" silver dollars ( they stay smaller). I keep the one pictured with a group of red terrors (festae) and a variety of African cichlids, Dragon blood peacocks, borleyi, yellow tail acei and Malawi eye biters. The GT is the tank boss. Keep AA updated on your additions.