I have a 45 corner back hex. It's a beautiful tank big but doesn't take up to much floor space. Right now it has a angel and some cherry barbs and some kind of fish my son caught out of the creek and threw in. I had to tell him not to do that anymore or he would have had it full!!! I'm not adding anything new cause I think I'm going to get some kind of little lizards when it's empty again. I also keep my feeder guppies in a 20 gallon with my turtle Tippie. My favorite had to be my tiger oscar though! I had "oscar" about 19 years ago. The prettiest setup though had to be when I had my Discus. I had a huge Amazon Sword plant in there and some driftwood. Beautiful fish!