zombie;344185 said:
Red sea is just calcium chloride and sodium bicarbonate. That wont add any nitrates or phosphates. What is your magnesium reading? If that is low, algae will take over regardless of skimming, amount you feed, macroalgae growth, etc.
No red makes a few a&b supplements, one is reef energy which is amino acids, fatty acid, carbs and vitamins. The other (and potentially more common) is red sea coral color a&b are a) halogens/iodine (I2, Br, and F2), b) Potassium and boron, but yes these shouldn't add any phosphates or nitrates, but curious as to why you are adding these, and are you testing for iodine and potassium?
Agree though that raising you mag up will help some with slowing the algea growth, but in my experience it wont eliminate it. It can certainly help but figuring out where the nutrients are coming from and cutting those down or adding fast growing macros to counter it will work a lot better.
Another option that can help control gha is to once a month do a 3 day no lights period. I do this as part of my regular monthly cycle and it can help to also slow the growth of hair algae