Some type of worm really likes garlic.

[reefbound]

This worm appeared when I dropped some garlic enriched pellets in the water,I never seen him before and after munching for a bit I noticed what looked liked a spider web hmmm??? and everything in the tank stayed away...

 

[Fluff]

Looks like some type of bristleworm. Obviously a scavenger. Most of the worms you find are harmless, he's very cool. Congrats.

 

[DragonForce]

I noticed a bunch of red and black ones in my tank recently. I wish I had some yellows like yours, very pretty.
Once they get large you may consider removing them.

 

[reefbound]

I noticed a bunch of red and black ones in my tank recently. I wish I had some yellows like yours, very pretty.
Once they get large you may consider removing them.

I also have a very dark red in there although I have not seen him in awhile...