Well then I would move the powerhead to give it more current than it would like so it will move. I had one of my 2 bubbletips take up residence in back of tank under a ledge and that's what I did. The next day it was in the front and has stayed there. Might work for you too....yeah I remember your clownfish, tries to feed the powerhead too doesn't it? Maybe if you can get the bubble tip out front and the powerhead moved a little the clown will decide to move into the anenome.