white golf ball like ?sponge?

swiftwind

Reefing newb
I know a lot of threads i yellow fuzzy balls as sponges and I think I have one of those but there's also a bigger (about the size of a quarter) white ball that is not fuzzy but almost has a spiderweb pattern on it. Are they both sponges? and are they harmless? I know the aiptasia is not but their proving difficult to eradicate.
 

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