Anyone know what these white fuzzy worm casing things are?

[Korrine]

They are growing all over. The rock, the glass, powerheads. What in the world are they?

 

[iamwhatiam52]

Pics are not close enough to tell for sure, but they look like pineapple sponges.

 

[Bongo Shrimp]

+1 for pineapple sponges. Totally harmless, I've got them everywhere too.

 

[Korrine]

wow a sponge? Wouldn't have thought of that. Thanks

 

[rusty-spoons]

Looks like a very new tank, if so they will go away with time.

 

[Korrine]

tank up since March