zoo help

I have greens algea growing on my zoo's. Most will still open, but I have a few (about 10 or so) that what open. Is their anything I can do?
 
Pray is not some type of fungus. I had some feather like looking alge growing off some palys and just tonight i pulled out the disk and manicured it with a tweezers. It was much thicker in there than i had realized but my palys always stayed open and hid it.
 
I don't know if that's the same situation as yours, but I had some fungus growing on a couple colonies awhile back. The polyps were opening less and less everyday and then started to shrivel. I did daily Furan-2 dips for 3 days and brushed the fungus off with a tiny soft tooth brush. It was pretty effective and all of the zoas have fully recovered within a couple of days.
 
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