White balls on LR

[JesseGnewbie]

Setting up a saltwater tank for the first time. Bought 60# of live rock off Craigslist. From a guy who had a 450 gallon he was slowly breaking taking down. Just wondering what these white balls are, one isn't really a ball but has what look like tenticals. This rock came from an established tank. I didn't cure it.

 

[Marbie]

They all look like sponges to me.

 

[JesseGnewbie]

Are the good or bad? If bad how should I get rid of them?

 

[Rutrag]

No worries. Sponges are harmless filter feeders.