Looks like a fire worm to me but I can't really tell the color. Google some pictures for a better identification. Some people throw them out and some keep them in the sump and then some of those that live dangerously leave it in the DT. Make sure not to touch it with bare hands whatever you choose.
not to hijack the thread but how do you guys tell the difference between bristle and fire so easy? probably my colorblindness but they usually look the same to me except the bristles on the fire worm are longer I thought. Im sure OP is curious as well.