I'm thinking of redoing the 37g but keeping the SA Bumblebee Catfish I have, I love them to much to give them away. But the remaining fish in the tank I might rehome.. I'm thinking of getting goldfish. 1-2 goldies. Don't want to overdo it. I know they get large and I know they create a lot of waste, I'm planning 2x w/c every week to help with that. I have two large filter running on the 37g as well, Cascade 300(100g, 300GPH) and Marineland 200(50g, 200GPH) I think that's more then enough on the tank.