| Hmmm...I dont have anything definitive or worthwhile to add which will help you ID the critter, but I believe my tank had several of them as well.
Very thin, segmented, moved quickly, hung out in the substrate, (finely crushed coral that was thicker than sand), head seemed to be larger than the body, very secretive, usually visible after lights out.
I thought it was predatory because of its speed, excellent vision, (even a red lense light, spooked it), and nocturnal habits. Sound about right?
Nick |