What is this white stuff growing on my LR?

Steve1500

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Tank is 1 year old.
Alkalinity: 8.3
SG: 1.026
CA: normally 420ish
Phosphates: .1 ppm
Nitrates:2-4 ppm

Any idea on why my LR is turning white? Is it a problem?
 
Look like Bryozoan. Nothing to worry about!
 
Thanks. Will look up Bryozoan.

My coralline looks ok and is growing.
 

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