I just restarted my 225g back up back in October and around February i started seeing these guys pop up in a few places. Now i've got one rock that is completely swarming with these and noticed a few more rocks are starting to take hold. heck i even have some grown on my back wall. I originally thought they were feather dusters but now i'm second guessing myself. they do appear to have the calcarios (sp) tubes on them as best as i can tell. other than reproducing so quickly, are they harmful? i figured they would be decent filter feeders. any thoughts?

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