on one of my live rocks I have a growth. I'm not too worried about it, as it is not a quick grower and is stationary (hence, not aggresive) but I just want to be sure that it's not a baddie.
It's a bit bigger than a silver dollar, and looks like a cobweb or a pile of cotton. In the center is something that looks like a feather duster, about a quarter of an inch across. Whatever that is, it acts like a feather duster, definitely a tube worm of one kind or another.
If this is bad, how do I treat it, else how do I feed it or just leave it alone?
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