I really enjoyed my pulsing Xenia, and have heard that when people switch to MH lighting the Xenias shrivel and die. I guess its better than taking the tank over, but i really enjoyed the way they pulsed and moved in the current:-/ Anyway does anyone know why the Xenia do this? I have had MH over my tanks for almost six months now and the coral just now started to die. It was in great shape two weeks ago and is now almost completely dead. Any Thoughts?