I've never heard of anything eating Xenia. Apparently, its bad taste is its major defense. I know of some people that wished they could find something to eat it. When it comes to Xenia there are 2 kinds of reefers. Those that can't get it to grow, and those that wish they could get rid of it. The main thing to remember about Xenia is that it is entirely photosynthetic and needs a lot of light. Its grows slowly in my softie tank under VHO's. It grows like a weed in my SPS tank under MH's. I recommend at least 5-6 watts/gal. for Xenia.
Gary
Gary
125 SPS, 75 gal. LPS/softie reef, 9 gal. Nano