Acropora coral

[Zbass]

I have a Snozzle berry Acropora I received on WED from Top shelf aquatics. I still am not showing and polyps at all. its very hard to tell if the coral is actually alive because its such a light blue it almost looks completely white. when the polyps come out they are supposed to be green, which will be easy top see when it does.
DKH=10
Ca=500
Mag=1300
PH=8.3
I do not have any fish in the tank only 9 coral. its under roughly 300 to 400 par. what should I do?

 

[chip shop]

Give it a bit of time

 

[Tahoe61]

An image under white lighting could be off assistance, if the coral doesn't show any PE.