I started a thread asking if someone wanted to trade clowns because my black percs wouldn't host the RBTA. Thats when I went out a bought the Allardi Clown. For the life of me I can't find the exact article I saw before where it showed exactly what species natural host bubble Tip Anemones. To sum it up for you though, percs and ocellaris do not naturally host bubble tips. Natural hosts for bubble tips include Allardi, Clarkii, Tomato, Maroon, Cinnamon, and probably a could more I can't remember but those are the common ones. You can get lucky and find percs that will host BTAs, I just tried and couldn't get mine to take interest in the anemone.