What are these?

[AntimatterBlue]

Curious to get help identifying that these are. They seem barnical like and are growing over the back wall in my tank, in the sump, and sometimes on my glass scraper.

 

[Troylee]

Spirobid worms.. harmless and will go away with time.

 

[Gumbies R Us]

Curious to get help identifying that these are. They seem barnical like and are growing over the back wall in my tank, in the sump, and sometimes on my glass scraper.

Had hundreds of these guys in my tank. Spinoid worms (what is in your tank) and pineapple sponges dominated my tank. They are a sign of your tank maturing and will eventually go away.