Red Worm on live rock question *picture*

I recently purchased 3 live rocks. On my smallest piece, I noticed a red, almost fuzzy, worm. Its super tiny and moves fast. Should I be concerned about this? If so, what should I do about it?

50g tank with 1 blackfoot clownfish, 1 porcelain crab, 3 dwarf hermits, 1 scooter blenny and 1 damselfish. 3 pieces of live rock total.

Any help is appreciated, I've heard bad things about these red worms.

Thanks!

pic below