everything turning brown

j30167

Reefing newb
My tank has only been going for 2 weeks, ita a 72 bowfront with live rock and live sand, the sand and rocks are turning brown what could be wrong, this is my first saltwater tank not sure what to do
 
It's most likely diatoms, they're totally normal in a new tank and they'll go away on their own.
 
thought I was doing somethin wrong
 

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