Rock turning brown

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Zecolmeia

Aquarium Advice Regular
Joined
Oct 4, 2012
Messages
81
I have some rock that is now turning brown. It was used in a saltwater but spent two or so years dry. All of a sudden the tops of all it is brown. Is this algae? If so how do I correct it? I plan on getting a pleco as my tank isnt fully stocked yet anyway.
 
Do you know what type of rock it is? It might be diatoms. You can just scrape them off but they'll likely come back until they run their course.
 
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