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I had a large one of these. it was growing a couple of inches from a brain coral I got. I didn't think much of it for a few months. When I noticed that it kept stealing the food i target fed my brain I broke it off but it was too late. now I have dozens of small ones everywhere including the back wall of my DT so I can't use glue on them so I'm going to wait until they're a bit bigger and pry them off. If you let them grow too big they release spores or something and you'll end up with an infestation. Although they may not directly harm coral they may cause some stress with their strings and hundreds of strings can make the tank look ugly.
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