not capable of stinging, as that has been stated. but allelopathy is practiced.
from wet web media
Star Polyps
Hi guys,
<cheers, mate... Anthony Calfo in your service>
Got a question for you on controlling Star Polyp growth... how do you do it? I started with a small colony, but it has since spread over 3 pieces of rock and I can see it's pink mat growing more everyday!!! Is there a way to control it's growth, or should I just prune?
<yes... simply prune and share frags with other aquarists, LFS, aquarium societies, etc.>
Will pruning damage the rest of the colony?
<not if you cut cleanly... tearing on the other hand is risky for all coral. Incise a portion with a scalpel or razor blade for a clean line of demarcation/termination. Then lift cleanly and firmly with tweezers>
Coincidently, my Sarcophyton has looked terrible lately (starting to drop, polyps not extending).
<Starpolyps are very noxious and aggressive (shedding "toxins" into water).. could be contributing a little>
One of my clowns has adopted it as a surrogate anemone host. Could that be the reason?
<some leathers don't seem to mind this... others seem to be quite irritated. I personally don't like it or encourage such repetitious stimulation>
Or maybe a combination of that and the huge growth of star polyps waging some chemical warfare???
<agreed>
Is there a way to discourage the clown fish from bothering the Sarcophyton?
<nothing predictable... I really don't recommend clowns for most reefs for this reason... they may even try to take residence in a long tentacled LPS coral (Goniopora, Caryophylliid, etc) which is almost sure to kill it. I'd pull the clowns in the long run or resist LPS corals if they shuffle hosts. Best regards, Anthony>