Hey Wolfen,
One mans pest is another mans pet. Some people want xenia and others just want it gone. Same with polyps and other softies like it. In my opinion, the trick is just keeping them in control. Usually not too hard. I remember seeing a pic on RC of a tank that was mushrooms everywhere you look. Nothing but! Basically, it all comes down to how you want your reef to look. Bottom line, I can't see them hurting anything at all if they aren't allowed to grow out of control.
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