Grey layer over my live rock

Sathish

Reefing newb
hi all , I’m a beginner in reef hobby and its been 5 days after my first reef tank set up and my live rocks started loading some grey layers and it spread very fast even over the sand . It looks to me some kind of fungs. Can some one look into the image and advice me please.
Tank - 150 gallon
Live sand and live rocks loaded
 

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