Yes...spaghetti worms. Definitely good. If you watch really, really closely you'll see them transporting small detritus along the tentacles toward the centre.
Every now and then, they'll shoot their waste into the water like a little jet. It just takes a split second. If you aren't looking directly at that spot when it happens you'll miss it.
If you've got too many, I would love to get some from you. I lost mine about a year ago when I had a cyano explosion.
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