You could try smothering them with some epoxy. This would basically be like putting chewed up bubble gum over them. This will eventually become hard and after awhile you'll never even know the Hydroids were there. You can start mounting corals on these spots & everything. A fresh start so to say. GL.
Thanks Cloak
I also saw an article on a chemical called Hydroxs. I am in the process of gathering info on all options then figure out the best way to go. I am hoping that there is/are some natural solutions to to eliminate the pest.
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