A Different Aproach To Gda

I allways had gda in my co2 tanks.
I tried it all. more nutrions. less nutrions more co2 less light etc.
I tried the leave it alone method.
After it got all brown i removed it and next week it was back again.

Last years i controlled it by keeping kno3 a bit low and it would just start forming on the most lighted part of the glass after a week.
2 weeks ago i got a bad outbreak after rescaping a small tank. Maby 2 weeks in.

I decided to do something different. I increased the light (adjustable led) and shortened the time it was lit with about 1 or 2 hours down to 7.
Things started to happen , after 2-3 days it started to decrease in the darker spots. My Hc started to grow like crazy, that prolly helped to.
I do not feed anything in the tank still these small critters multiplied and started eating the stuff like crazy
so i had some help there to.