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I've been looking for a ID for these for a few days and I haven't found anything close. I know that they are in the family of Polychaete worms, I'm leaning towards the class Nereididae because they have larger more defined heads. Did you use live rock in your tank?If so do you know where it came from? I'm trying to maybe pinpoint the location so it might be easier to find a ID.Thanks for all of the ideas. Unfortunately, I have no idea what they are. I tend to think they’re harmless though. There are hundreds of them in my 120, and I haven’t noticed anything desirable getting eaten. I may thin them out some just due to quantity.

