First off the tentacles should be waving loosely back and forth not blowing in any direction. I don't feed my plate. "Fungiids bear endosymbiotic algae that require strong light, but all benefit from regular feeding as well." However I would guess that you can overfeed andor feed food that is too large, which I believe is what is happening to yours. My plate gets its food from the water column when everything else is fed.