Yes! You can overfeed your long tentacle anemone. I had a new one that was pretty small. I fed it pieces of frozen food through a turkey baster and all was well... but one day I decided to give it a whole shrimp. It pulled it into its tentacles and swallowed it whole. The next day the partially eaten shrimp was sucked against the powerhead, being ejected overnight and the anemone was shriveled up like a prune. The worms ate most of it before I could get it out of the tank. DEAD.