Mushroom Bleaching (Pics)

[Drewsus1010]

Hi,
I have these green mushrooms. The guy that i got them from called them inedible hulk mushrooms. Lately, some have shrunk, lost all color, and are peeling off the rock. Why does this happen? Do i need more light?...less? Parameters are great. Other mushrooms in the tank are thriving.
Thanks

heres a pic

 

[tahoe61]

Mushrooms

Mushrooms

Sounds like systoms of too much light to me. What type of lighting do you have? And do you know what type of lighting they recieved before you got them?