Clowns will host in anything that's got some wiggly parts, mine are fond of frogspawn, hammer corals, Long Tent. plate corals so far, but they like the BTA the best. They can bug the heck out of corals and if it's not liking the way things are chances are it wont adapt. My suggestions are either get another BTA or get a new home for the clown, it's their nature to host in something. Seeing as your tank is a 20 gallon a second BTA may not be the best bet but on the other hand it depends on what you want and where you want to go with the tank.
Doug
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