Denise,
I've had 'shrooms for around 8months and have had the chance to notice some behaviors. I think the main thing is they are low light corals and can be scalded by too much light...they will lighten in color all the way to white. Anyway, they seem to be real hardy but I would watch the water conditions and try to keep it as pristine as possible. The other thing I noticed is once I started supplementing, more for some nice anemones I added, their color also intensified, so just another sign...anyway, the other thing I thought I'd mention is feeding them directly has helped their growth immensley. I tend to do most of my feeding with a turkey baster, and I just simply squeeze a chunk of whatever I'm feeding on them, and they'll soon fold over the chunk and devour it! hope this helps!
Dave