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Ditto on the great growth. Your plants look VERY healthy! (and so does th egreen water...). 
I used the blackout method with good results, BUT, I only had low-light plants, so they didn't die. I don't think it's worth the risk for you at this point, like Logan's Daddy said.
Instead, make sure your amounts for dry ferts are right (I wouldn't know...I use liquid), if your lights are on more than 9 hours, cut them down to only 9 hours, and turn the CO2 up a bit if it's less than 30ppm (if you have a drop checker...if not, then be careful with this).
Another thing you could try is the split photoperiod that Dianne Walstad uses. 5 hours of light, 4 hour "siesta", 5 hours of light. That gives a 14 hr photoperiod with only 10 hrs light. I didn't think it would have very good results when I read about it, but I tried it anyway just for grins, and have had wonderful results with it...I guess going on a month now. I don't plan on changing it.
Anyway, that broken photoperiod may help with the green water situation after a few days, and then you could go to a normal 9 hr photoperiod if that's what you'd prefer.
Keep up the good work with the plants!
-Dave
I used the blackout method with good results, BUT, I only had low-light plants, so they didn't die. I don't think it's worth the risk for you at this point, like Logan's Daddy said.
Instead, make sure your amounts for dry ferts are right (I wouldn't know...I use liquid), if your lights are on more than 9 hours, cut them down to only 9 hours, and turn the CO2 up a bit if it's less than 30ppm (if you have a drop checker...if not, then be careful with this).
Another thing you could try is the split photoperiod that Dianne Walstad uses. 5 hours of light, 4 hour "siesta", 5 hours of light. That gives a 14 hr photoperiod with only 10 hrs light. I didn't think it would have very good results when I read about it, but I tried it anyway just for grins, and have had wonderful results with it...I guess going on a month now. I don't plan on changing it.
Anyway, that broken photoperiod may help with the green water situation after a few days, and then you could go to a normal 9 hr photoperiod if that's what you'd prefer.
Keep up the good work with the plants!
-Dave