Found in the Filter sock

[Ramon Estevez]

Large Bristle worm check this thing out!!!

 

[Ramon Estevez]

About 6 inches long

 

[Elgringodiablo]

I pulled one over a foot out of one of my tanks. They can get nightmarishly big.

 

[Salty1962]

Bristle worms can get pretty long. I had a 90 a while back and when I was cleaning I caught 2 @14-15" long. Good part of CUC. Just don't touch;)