I came home from work and my anemones in the little grooves of the Hydor 3 powerhead. Half of him is out, the other half is still in there. A few of his arms were severed but most of him was spared from the propeller. I can't tell if he is alive or dead. I have read some threads where the same thing has happened to other people and their anemones eventually recovered and lived however I have also read a dying or dead anemones could wipe out a whole tank. what do I do?