Hi Marie,
This being the Fauna Marin product forum we can only really talk about FM products here.
To control Algea we first need to know the route cause before suggesting any Fauna marin product (that goes for any product as well really)
If you can get back to us with your "true" PO4 results and nitrate results, we can then establish a maintenance plan for you.
Using FM products you would only need two
Ultra Bio
Ultra Bak
This is the uilding blcoks of low nutrient dosing and will keep you nutrients in check
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