That's interesting my tank nitrates are as good as they have ever been and the water quailty is great! I'm glad to hear that these xenias just do that from time to time. A few of them seem to be inflating again so it looks like they might come back! I thought it might be because of the other softies I have in the tank. I have two clowns a ckarkii and a tomato they both have hosted a plate coral together it's funny to watch them. But I thought that they may have taken something from the plate and gave it to the xenias that caused them to wither but i guess maybe not... any way thanks Ya'll...