I would guess that its getting more lioght if it is turning green. I had a watermelon echino turn green when I put it out in the open under a 400W 20K XM, hasnt turned back in 6 months, still green with yellow eyes.
Amzing how those words go together- B#%$^ maroon clown. Mine has her interior decorator degree from some oceanic school none of my other fish have veer heard of and shoves it in my face every day... Does she cover it in sand, or just throw it around the tank?