Are Valonia Bubbles Hard?

I just noticed a couple and was contemplating picking them off...

They're stiff... almoast like a frozen pea type of thing. If you do decide to remove them, remove the rock and do so in another bucket of saltwater. You dont want spores in your tank should you pop one by accident ;)
 
I'll have to put some more thought into that then... it's quite the hassle getting that rock in and out.
 

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