mandown123 Member Rating - 100% 19 0 0 Location Staten Island, NY Jan 11, 2015 #1 hi all, I am of the mind to do a BTA and Oc. Clowns focused tank. How many clowns can I, and Should I add to this 30L setup, to induce natural harem behavior in a 30L? Tank bred clowns. They will be the first inhabitants of the tank.