I introduced a Eibli on 7/12 to my 55 gal.We was very healthy and well fed. He is not eating and is laying on his side under live rock. Is this common? I have tried for 3 days to get him out without tearing down my tank...I would like to put him in a smaller tank by himself. I am offering kelp flakes,cyclopeez, algae sheets,frozen mysis&brine and other flakes! he is not interested in eating. Any suggestions?