Still have algae with NO3PO4X

[Hythe]

My 500Litre tank had severe green hair algae(GHA) and I started to use NOPOX around six months ago. It is a excellent product and from having GHA covering every rock surface plu rear tank glass, using NOPOX reduced the algae by 90-95%.
My question is HOW do I get the algae to go completely?
After the inital reduction of GHA - which took about three months - I did reduce the dose of NOPOX. But because the GHA was not eradicated I had to increase the dose back up to 10ml morning and 10ml in the evening. That's 4ml per 100L daily. That seems like a lot. What do you think about the dose rate? If I increase the dose what could go wrong? Tank Parameters are: NO3 zero. PO4 0.08. CA 490. MG 1450. KH 8.1dKH(2.9Mql) PH 8.0. SP=1025 (Using Redsea Pro)
My skimate is the colour of assam tea (using Redsea C skim 1800) and it pulls about 500ml out daily.

[Reefing Madness]

Along with my post on your other thread, have you tried GFO? Do you have a Reactor? You must follow the instructions, but you can keep the stuff in your system to keep Phosphates out. Might try
Aquarium Chemical Filtration Media: Chemi-Pure Chemical Filter Media
Just thoughts

And this is on sale right now, good stuff here:
4 types of algae eaters = 50 snails + Free Shipping - Only $29.99

[Hythe]

Along with my post on your other thread, have you tried GFO? Do you have a Reactor? You must follow the instructions, but you can keep the stuff in your system to keep Phosphates out. Might try
Aquarium Chemical Filtration Media: Chemi-Pure Chemical Filter Media
Just thoughts

And this is on sale right now, good stuff here:
4 types of algae eaters = 50 snails + Free Shipping - Only $29.99

Hello again Reefing Madness. No I'm not using GFO because RedSea say not to use it while dosing NOPOX.