Yes definitely. Removing urea from the equation completely eliminated GDA. Hair algae is still present but to a far much less degree. I would say maybe 95% less. In fact I can't see any on the plants. Only on the glass. I attribute this to the higher lighting.Hi @Hanuman, I struggle with the same green hair algae. Can you confirm they have gone when you minimised ammonia as a source of nitrogen?
APT3 works fine in my experience and I wouldn't worry about the ratio. It has worked fine for 100s and 100s of people. This said I recommend using APT3 with a rich soil. If your soil is deficient or you are using some inert substrate it's better to either add root tabs and keep using APT3 or use a liquid fertilizer with higher N in it.