What the absolute fetch are these??

[tjbrownie]

Found these in the back chamber of my tank this morning. Absolutely no clue what they are but it’s concerning me. Definitely not flatworms, they are coiled like a worm and not moving.

 

[Gernader]

Looks like spirorbid worms. Not bad to have them and completely normal in many reef tanks

 

[stanleo]

They are normal and harmless especially in new setups. They are called spirorbis and are harmless filter feeders. Nothing to worry about.

 

[tjbrownie]

They are normal and harmless especially in new setups. They are called spirorbis and are harmless filter feeders. Nothing to worry about.

Awesome