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You might make a 10% solution of peroxide in s/w - provided it's 3% peroxide. That's what we get at the pharmacy in the States. It looks like a "japanese deepwater" that I recently picked up - which means it is going to like cooler water and higher flow than most. "japanese deepwaters" like fruit loops, LA lakers are notorious melters when they are fresh. They are tidepool and shallow water species from Taiwan. White fungus is common with those ones. If the affected polyps are squishy or empty inside, then cut them out. I haven't tested this theory yet, but I suspect you might get some UV sterilization by putting the colony out in the sun for a little while. Search for a thread (I think it's on here, too) called native zoanthids of Taiwan for habitat info. I would think a tidepool species would be a good candidate for solar cleansing.

