I picked him up yesterday. I have a 55 Gal. tank with about 20 Lbs LR, 1 Yellow Tang, 2 Yellow Fin Damsels and 12 hermit crabs (I mean 4 hermit crabs). 8 of them dissapeared in the last 10 Hours. How do you get them to start eating less expensive food? Not sure what kind he is but he changes color quite a bit, light brown most of the time.