Your tank is out of balance, the traditional wisdom of the board would be to boost your frets and cut your lights and pump in lots of CO2 in hopes of overdriving the plant growth and using up the excess nutrients in your water.
My advice -- simplify. I'd cut back on the frets and the lights, the excess of both is only feeding your algae at this point. If you're using a substrate with a high CEC, it will release nutrients back into the water. Your plants growth will slow, but it will help knock back the algae.
If your selected fish can handle it (or even benefit from it), try backwater extract. The tannin will inhibit the growth of the algae. You might have to work adjusting the use of black water extract to keep your water mostly clear, and
free of algae. You could add the carbon back to your filter(s) (along with Purigen) to reduce the unwanted yellowing effect of the tannin, with the excel dosing levels you are using, it will have little impact on the frets. The black water extract will help lower your pH and soften your water.
You could over use the black water extract to kill off the algae in one big hit. Then use large water changes and then let the carbon (and Purigen) pull it out of the water once the algae is gone.
I had a tank over run by algae, due to a lot of direct sunlight, and failed cap on my MGO (dirt) substrate. After converting the tank to a black water set up (to make the fish feel more at home) I have no algae. I still have all that sunlight and my filter still gets clogged with dirt from the failed capped substrate -- but no algae.
Your algae didn't happen overnight, don't expect to go away overnight either.
Algae over run tank.
Black water clean tank.