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I finished a blackout myself because of blue-green algea. I covered the tank and had the lights out for 3 FULL days. I didn't peak to see how things were and didn't let the kids look either. Yes, you need to turn OFF the CO2 during this process. Adding a air stone may also help with the fishes (I did for mine).
After the 3rd full day take it down and do a complete cleaning scrubbing down the walls and pulling any loose algea you find if any was left over (I had a VERY bad infestation and 99% was gone after the 3 days). Then do a 50% or so water change and also change the filters in whatever style filter you have.
It has been about 3-4 weeks since mine and I'm still going strong with no algea. I have converted to presurized CO2... I had DIY and that may be what caused my algea problem to start with.
Good luck!
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