So I assume this could be the culprit for the zoa's irritation. Underneath the zoa's is the same thing. I have been manually removing these with a pair of tweezers, but they seem to be all over the place.
I appreciate the response, if anybody else here wants to chime in on ways to irradicate these that would be great. I am assuming a underwater blowtorch, just like the colonial hydroids that I have. Would an Iodine dip remove these from the zoa colonies?