For 3 years I had 90gal. reef tank. Sand was clean and white. Then 3 months ago I upgraded to 125g. Like everybody suggested I used only couple cups old sand and bought 80 pounds new aragonite. Everything from 90 was thansfered, included 150 pounds of live rock.After 4 weeks in my new tank i started get algae. Why? What can be the reason? Salnity-1.024 nitrate-5.0 nitrite-0 amonia-0 PH-8.2 phosfate-0.1 alkalinity-5mq/l witch is like 13 kh.Looks great to me.So why algae. I feed every other day .5 fishes in the tank and lots of corals.Every 2 weeks 25 gal water change <ro>. Please help.I think it is diatoms kind of brown and dark red. I try to put picks but it does not work.