Originally Posted by TheChad
I have never seen the camel shrimp anyware around the small cluster.
Your thinking on this is understandable but you can't watch them every minute to be sure they aren't bothering them.
I don't know if the shrimp are what's wrong with your polyps but from the info you've provided, they seem the most likely suspect. Otherwise, you could try replacing your light bulbs. I have no experience with T-5 bulbs and don't know how often they should be replaced but if there has been a color shift in the bulbs due to age, that could cause your corals to be unhappy.
It could also be a chemical problem. You could try doing a few extra water changes and run some activated carbon if your not already to see if that helps.
I would also keep checking at night for anything irritating them just in case. Sea spiders feast on zoas and are almost impossible to see, sundial snails are small and may be hidden within the stalks out of sight. Just some ideas.