Ogredawg: Thanks for the feedback! No, my clowns are not hosting the BTA yet. I've had the Bta for about 5-6 months, but the clowns have paid no attention to it. Are there ways to get clowns to host my BTA? My HYDOR Flo is great, it gets a nice amount of cirrculation around the tank, but I plan to get a more powerful powerhead because I think the tank could use a little more Cirrculation. I got it from my local fish store.