Pls help ID

#1
So in my quarantine tank ive found a bunch of new worms, this one eats algae off the glass and can move rather quick. View attachment 21779

it has many hair like legs like a bristle worm but is not. I also have smaller ones that collect in the magnafloat cleaner but they have black and white stripes.

It looks like a beneficial cleaner by observation but just wanted to check before I shared some live rock with my cousin.

Thanks for the help!
 
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