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Emerald crabs are said to eat it. Manual removal, being careful not to pop the bubbles, is always an option, sometimes. And of course, eliminating the source of the problem, water quality and light being big factors.
Just pull the frag and scrape it off the plug. Be sure you scrape it all off, easiest way I've found is to scrape a layer of the plug/rock off too so your sure it's all the way off. Rinse in sw and put it back in the tank. DO NOT pop them in your tank
Well I just pulled the whole frag out and removed the part that had the algae then re glued it. The mushroom I had on it seemed to not mind it one bit and opened right back up after about an hour. Another potential disaster avoided due to the help of you guys. ?