Beginning to see some brown algae, should I be concerned?

[cardsfan16]

Hello Everyone, I'm hoping you can provide some input for me.
About two weeks ago I set up a 75 gallon. I have two Rena XP 2s, two Maxijet 1200s, and a ProHeat 250w (maybe 300w) titanium heater. My lighting is the 48" Coralife Lunar Aqualight, and I run the lights about 10-12 hours a day (getting a timer later this week to make this a more precise number). The temp is now steady around 80 degrees, with minor fluctuations with my light cycles. I used tap water to start the tank, and treated it with the recommened amount of a 'Prime.' On Thursday of last week I added the substrate and 50lbs of cured liverock. (Nothing else living in the tank).
Problem: What I'm beginning to see already is some brown algae growing on parts of the live rock. It isn't alot, but I'm seeing more now than I noticed even yesterday morning. I'm not seeing any on the substrate or the tank walls.
Question: Should I be concerned about this, and if so, what can be done about it?
Thanks for your help in advance!

 

[bigarn]

The brown algae is diatoms which is normal for a young tank. This will pass on its own, but you should use RO water ...... tap will add to this problem and alot of others.

 

[xjayx]

nope
It's a good sign.
What you see is diotoms and most if not all new tanks have them.
They will go away once your tank matures however, it may get worse if you continue to use tap water.
I'd start doing water changes with RO water from now on.
And once your tank finishes cycling, you can add a clean up crew.

 

[cardsfan16]

Hey Guys,
Thanks so much for the replies and helpful information! I'm certainly going to start using RO water in the future.
Question about the cleaning crew. I'm not planning on adding fishes any time soon, as I'm going to be out of town for about a week in early August--hence I won't be adding any food to the tank either. Assuming the tank cycles before then, is it still OK to add some form of cleaning crew?
Thanks again!

 

[philgmiami]

USE R-O WATER AND YOU WONT HAVE THEM PROBLEMS.. I USE TO USE TAP ON MY TOP OFFS AND NOTICED BROWN STUFF ALL OVER MY SAND. I USE R-O WATER NOW AND HAVE NO PROBLEMS WITH THAT BROWN STUFF :yes:

 

[reneerose]

what is the RO water you arfe taking about?