i have 7 cory cats(1 panda, 1 albino, and 5 emerald green ones) in my bedroom tank with some of my cichlid growouts (red texas, dovii, lyonsi) they do a great job motoring all over the tank and don't seem to get chased by my growouts. The only negative was that I had to change my substrate. I originally had sand( virgin white silica sand) in my tank, but they always shot it up into the tank making it cloudy as they were foraging for food or just playing..... now I have small black and white gravel(it looks almost like gravel chips) in there, and they dig that too.