I put my haddoni in my 28 gal a week ago. I put him on the sand and he moved over to the side of a live rock. why would a haddon's do this? Is there something wrong with it? wanna get this thing to stay put somewhere so I can place a few corals. Also he use to be a tan- brown color, now it's gotten lighter (almost an off-white) and translucent. Nutrients deficiency?