What are these?!?

[5280Reef]

Can someone help me identify these? I believe they came on a coral I purchased and are growing around the tank. It kind of looks like bubble algae, but there is an open end (or mouth) in all of them.

 

[F i s h y]

Pineapple sponge. Harmless filter feeders.

 

[Rufus’ goofs]

Definitely looks like a pineapple sponge. friendly little gifts from the filtering gods.

 

[5280Reef]

Haha, awesome news. Thanks for the quick help!

 

[KingTideCorals]

Pineapple sponge just a cool little filter feeder to add to your micro fauna..!

 

[vetteguy53081]

A sign of good water balance. Generally found in sumps