I have an emarald and a red methrix crab for about nine months now and both seem to have become very dull in coloration. Is there diet lacking something? I have a 110 gallon tank with 120 lbs of live rock my live rock has good amount of ppupprple algea but no green is this the problem. Fish wise the tank houses a yellow tang, flame angel, purple tile fish, two maroon clowns, and corral beauty angel, and an orcid dottyback. I feed them a veriety of frozen foods as well as algea sheets so figure there should be enough scraps. Oh tank also has about 30 hermit crabs some scarlet some blue legged.
