I just want to share because it seems like a great success. I did a 50% water change in my 20 gallon and started to think... It was okay when I had my 4 brochis and 4 bronzes in there with my male betta. But then I partitioned the tank to put my female betta in there also. It seriously cut down on the corys swimming range. So I took the bronzes and put them in with my 4 albino corys, 1 peppered cory and 1 mystery cory. Everybody seems to be very happy. Shoaling together and swimming up and down the front of the tank and foraging like mad. When they were in the 20 I never saw them except at feeding time! So...I spent a half hour watching them this morning and was late for work again! LOL