White stuff growing on rock

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SaltyH2O

SaltyH2O

Aquarium Advice Regular
Joined
Jul 5, 2011
Messages
74
Location
Indiana, USA
I purchased some dried out rock that came from an reputable saltwater dealer and after a few days of it's new home in my tank its growing white cotton looking stuff all over the underside of the rock. What the heck is it?
 

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