Need help IDing critter

[bandos507]

Hi!!

Life got in the way of me maintaining my aquarium for about 2 years. Thankfully all my fish are alive and well. I’m ready to do a good cleaning and focus on maintaining it. Just noticed these worm like critters ALL over the sand bed. What are these?? What types of fish feed on them??
Thank you!!

 

[Mikedawg]

Look like bristleworms; using a trap is probably most efficient way to catch them if they bother you - check YouTube. Might also try reducing feeding.

I consider them to be a valuable member of cuc.

 

[Anemone_Fanatic]

I second that. Bristleworms are generally harmless, but look just plain awful, and can poke corals with their spines. Triggerfish, arrow crabs and large wrasses eat them, but those aren't very reef safe. Besides, adding things to eat others reduces the results of the problem, but doesn't solve anything. I would reduce feedings and trap them out.