In my opinion, a better way to dose nitrogen is with seachem flourish nitrogen. Its more expensive but Id rather dose something that is made to use in aquariums. Or use pure KNO3 from a hydroponics supplier.
As others have said, you also need to up your phosphate. Stop using GFO, feed more, set your skimmer to skim very dry, reduce your chaeto lighting period or take it out completely. Or dose N and P. Again, I like seachem's phosphorous additive.
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