What is this guy?

Put some shrimp in a water bottle with a piece of tubing through the cap into to middle of the bottle. If he goes in he probably won't find the exit
(The give him to me)

I was thinking something just like this but didn't think about the tubing! Good idea!
I'll get him!
 
They are a common Bristle Worm and can come in about 10,000 different species some can get very large and some are just great for your refugium that eats up your detritus, Fire Worms are Black and are dangerous to yuor reef and will take out your fish if not careful. I would just catch him and put him in your Display Fuge if not let him keep your bare bottom clean
 
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