Thanks, if it is starting to bleach or is bleached how can i tell and what measures can i take to help the nem recover. One other thing, attached to its foot was a hermit crab which i didn't know was there untill i was taking the photo and i saw something moving underneath it but it looks a little odd it has one claw bigger than the other i would say twice the size and both claws or white on the end, any ideas if it is reef safe or what sort of hermit it is as i have both red legs and blue legs and it looks nothing like either of them. Cheers.