I have quite a number of these. The color is difficult to discern in the pic...it is gray. Almost 99% sure its a bristle worm...what concerned me today is that one of them appear to be within the skeleton of a button scoly.
Its not terrible, I've done it alone with a 30 gallon. Rocks in tubs or buckets, bag up what you can in terms of corals. Use some airstones. Have a ton of water ready to go at the new location. Try to disrupt as little of the substrate as possible.