I never did try the epoxy trick so I'm not sure. If I was to do that though I'd only do a few patches at a time. The underwater epoxy is not always the nicest to work with (it's more of a putty than an actual adhesive). I could see this getting kind of expensive since even the cheap epoxy is still like $10 per tube.
Sorry I wish I had better experience to draw on. All I really know is that shortly after adding a potter's angel, the hydroids started to disappear. I had also read that pygmy angels (any of the Centropyge sp. angels) will nip at hydroids so I still think that might be worth a shot for you.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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