I saw the picture in your 28 bowfront thread of the anemone/clown underneath the return just get a credit card and gently peel its foot off and encourage it to move somewhere else. It takes time for them to acclimate to lights and a new home. What size is that powerhead? You may need to play with the direction, it could very well not like your flow. From my experience they do not like alot of turbulant areas but like a gentle back and forth.