WhiteDevil

I meant 12hrs, sorry, On at 730am off at 730pm

mos90

12 hours may still be too much light for a tank with no c02. im still tring to get mine right to get brown hair algae under control. im down to 7 hours at 1.8wpg cf, and i use co2 and ei dosing.

u could try a 3 day blackout, then clean up some dead algae, try 8 hours to start. it cant hurt. more light requires more co2.

is your algae just green spot on the glass? if so then just scrape it off,do water change and cut lights back. no need for blackout. blackouts seem to be the only way to kill brown hair beside tearing the tank down.