, Xenia is a great barometer for tank conditions. Xenia is a coral that requires good to great water quality. It also needs pruned every once in a while. I find that mine gets happier when I do that. Iodine is a must IMO
for good health. One thing though. Xenia is a coral that does not require feeding. It survives off of symboitic algae (xoozanthellae). Feeding phyto can increase the levels of nitrate and phosphate in your tank thus creating a bad environment for Xenia. I am not saying that it is the problem, just a thought. Another thing is lighting. Xenia does like light also.