Mystery worm long spikes

[Blackop555]

I read lots of posts here and wherever else I can on Google but couldn't find anything quite like it. Thought bristleworms but the larger one definitely has less spikes like you could actually count them. He's bottom center of picture. They are very fast and dissappear in blink of an eye if glass is tapped or you make a sudden movement or camera flash

 

[ISpeakForTheSeas]

Looks like a Syllid worm:

Based primarily on the long, hair-like chaetae (bristles) sticking off the sides, I’d guess a Syllid worm (taxonomic family Syllidae) of some kind. If it is a Syllid worm, then there’s a good chance it’s safe (and good CUC). However, some Syllids are known to eat sponges, tunicates, and - reportedly from some hobbyists - soft corals. The eating of soft corals is firmly disputed though, as many people (primarily from several years back, when Syllid worms were apparently more common hitchhikers) also report having them without issues even if the worms crawl over their soft corals regularly.

So, it’s probably safe/beneficial, but you can always sump it to be cautious, you could isolate it and offer it a cheap soft coral or two in addition to some fish food to see if it’s coral safe.

Some context for their diet (the paper linked below is “The diversity in diets of Syllidae (Annelida: Polychaeta)” by the università di lecce (the University of Salento).

https://www.vliz.be/imisdocs/publications/289130.pdf

 

[vetteguy53081]

I read lots of posts here and wherever else I can on Google but couldn't find anything quite like it. Thought bristleworms but the larger one definitely has less spikes like you could actually count them. He's bottom center of picture. They are very fast and dissappear in blink of an eye if glass is tapped or you make a sudden movement or camera flash

Looks like either hesionid or as mentioned syllidae. Hesionid eats worms and snails and syllidae eat sponge and hydroids

 

[Blackop555]

Looks like a Syllid worm:

Good info. Doing some research. He can have my xenia and gsp lol. Hopefully leaves the zoas alone