ID Please: Thin, White, “Worms” On My Rocks?

[JumboShrimp]

Currently there are no fish or inverts in my BioCube... now I’m noticing lots of these things. They are white, extremely thin, and some are about an inch to an inch and a half long. ID? Thanks!

 

[Sharkbait19]

Do they move? Could be some sort of sponge.

 

[PeterB113]

+1 for sponges I have the same type.in my tank. It's unsightly but doesn't hurt your corals. Also be careful if you pull them out with tweezers because it could make them spread best bet is to take the rock out and remove them

 

[JumboShrimp]

Wow, my mind wasn’t even in “sponge” mode. Very interesting. Does anyone know what they are called?

 

[tjohnson3]

Think it’s just called a white sponge… some refer to it as spaghetti sponge. Keep away from corals… good filters but can become invasive