Can anyone identify this

[Jcap74]

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please help have no idea found in rock in refugium

 

[Naiad]

Peanut worm

 

[Tahoe61]

Peanut worm

^ yes most likely.

 

[Jcap74]

Are they bad for reefs or ok

 

[Naiad]

They are great as long as the rock they are in gets good flow. They eat detritus so if there is no flow a lot of Poop can build up in the rock. I found this out when I had one in a low flow area of a refugium.

 

[Surfintx2004]

I have to agree its a "Peanut Worm" Here is a Site I like to use. Xtalreef - Reef Saltwater Aquarium

 

[Reefing Madness]

Peanuts by Ronald L. Shimek, Ph.D. - Reefkeeping.com