Does Anyone Know What These Are?

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I have these all over my tank, they don't seem to be doing any harm. Just wanted to see what they are.
 
The tubeworms? They're harmless. Kinda cool and pretty. I suppose if you have a really dirty tank they could breed enough to get a bit ugly, but otherwise harmless.
 
Thanks TwoHedWlf. I agree, these are kind of pretty with the red fans and all. The tank is pretty well maintained but not pristine.
 
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