Well, there are lots of options out there, so first decide on what types of fish you like, If you prefer bigger fish, smaller fish, or medium fish. Also, do you like aggressive fish, moderately aggressive fish, or none aggressive fish. You can get angelfish (small to large), tiger barbs (small to medium), or even Black mollies (small). If you want some bottom feeders on top of those, there's always red clawed crabs (mostly medium), African dwarf frogs (small to large), or even something like some type of shrimp. There are several types of catfish, or sharks that you could get if your into more aggressive type fish. They have catfish of all sizes, and those you can get moderate aggressive, very aggressive, and I'm pretty sure you can get them not aggressive., and they also have sharks of all sizes, but most of those are pretty aggressive. Well, sorry this was so long, but I hope I helped. Have fun with the fish.