It can take them awhile to anchor. Try placing it where it can't tumble. Put some rocks around it or something. Eventually it should. Are your parameters within proper ranges? And croceas like a lot of light, so if you are running t5's, place it higher up in the tank.
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Andy
Sacramento, CA
Current Tank Info: 55 gallon reef w/20 gallon sump/ER135/ 75 pounds of live rock, 4 in sandbed, 2 b&w ocellaris clowns, yellow watchman/pistol, rosy scaled wrasse, Mystery wrasse, Copperbanded Butterfly, Lighting 48" outer orbit 2 150 mh/ 4 t5 actinics
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