I have 8 Tiger Barbs with an Angel and 4 Gouramis. I have very few agression issues with the other fish. I also have 2 GIANT Danios(when you see "Giant Danio" in the pet store its just a name...mine are 3½" to 4" long) and I have named them Starksey and Hutch because they wont allow the TB's to mess with anyone in the tank other than themselves....Maybe I am just lucky