Coralline algae question

[Neil57]

My tank seems to be cycling along pretty well. It's been about 6 weeks now. The nitrates are finally starting to drop to 10. Ammonia and nitrite are at zero. My question is can coralline algae be white? I have some very white growth showing up on my live rock. It's looks to be encrusting the rock like I assume coralline algae would do. Here is a picture.

This last picture is a close up of the growth. Or is this something else?

Thanks for the help,
Neil

 

[Justfebreezeit]

Does it blow off with a turkey baster?

 

[Neil57]

Does it blow off with a turkey baster?

No it's hard and attached to the rock.

 

[Justfebreezeit]

Keep an eye on it to see if its actually growing. It looks liked dead coralline algae to me.