A little back ground. The tank has been up and running for 7 years, and I accidently overdosed iodine which caused my pom pom xenias to go bananas. They are steadily encroaching all over the tank with little pause. I've taken care of a few with amquel injections, and some with a mojano wand; however, it seems any cell that burns off just blows around the tank and starts a new colony. I bought a pyramid butterfly, but my twin bar rabbit wouldn't leave him alone. As far as I know the Pyramid is the only fish that eats xenia, but I am wondering if anyone knows of another organism that eats xenia or another natural solution.