Algae problem?

[Triggerman]

So I set up my new 220 gallon sw aquarium about 4 days ago. I am starting to see yellow algae (I think) growing on my live rock, also the top layer of my live sand is turning the same color as the rock. Is this algae and it is normal? I tested my water last night and 0 ammonia, nitrate, and nitrite levels. Ph is 8.2. I'm new to the sw world and will probably be asking a bunch of questions.

 

[all4wheels2]

Is it yellow or brown? Brown algae are called diatoms and they are normal after the startup of a new tank.

If it truly is yellow, then I can't help you lol. I've never seen yellow algae

 

[Triggerman]

It has a yellow/brown tint. If it helps I used my Lfs's reef water ( about 200 gallons ) to set up my aquarium