bristleworm

They can be beneficial and harmless.

heheh, they ARE beneficial (detrivors, eating poop and left over food) and CAN BE harmless ( as long as you dont try to pick them up with your fingers.)

that hair algae on the the other hand is certainly detrimental to your reef
 
you say harmless i gotta disagree my tank had some big suckers in there and they bite and man do they ever aggravate your fingers i dont miss them one bit
 
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