Need help with ID

[Acrowhora]

I have these buggers that come out when the lights are out.they swim around fast with long body and many legs,they don't seem to bother my corals.i have no idea what they are.thanks in advance

[saltyair]

hmmm how big are they? when they swim do they wiggle like a snake?

could be baby bristle worms or large type of isopod