Hi Ricky,
I posted that problem with my frilly mushrooms about a month ago. I read that they are stressed from either movement into a new tank and/or the change in water qualities. My bleached mushrooms did not die...they have gotten even bigger, but are staying white instead of a pretty mauve color. Members here also stated that mushrooms are as hardy as heck and very hard to kill!! I don't know what kind of frag corals you are talking about. My mushrooms were very large and mature. Let's see what others have to say. I know they will ask what your water parameters are, so I would get that posted!!