Na but they can be if near sps IMO . The mucus picks up particles and such which the worm feeds off of . Some times these long spider web deals can get tangled in an sps and bring detritus to the coral . I have one in a cap that brings a nice lil pile of crap each day to the cap and I have to blow it off. I just havent killed it yet.
Yup, mine were cute when I had 3 large ones. Now I have about 4 dozen! They always have a party in my tank during water changes.
Now they are a nusiance!
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