Joergen
I suspect you need to raise the nitrate levels and most likely the phosphate levels. I read what the claims are of that fertilizer but they are wrong. Many people thing there is a relationship between iron and staghorn algae. Try upping the NPK and adding less of the traces and more carbon. Seachem excel would be helpful right now.
I suspect you need to raise the nitrate levels and most likely the phosphate levels. I read what the claims are of that fertilizer but they are wrong. Many people thing there is a relationship between iron and staghorn algae. Try upping the NPK and adding less of the traces and more carbon. Seachem excel would be helpful right now.