Ensign420

@GhettoStyle, Sorry for the late reply dude, Well yes and no. The yellowing of the leaves during all of my early grows (which were DWC attempts), were caused to the lack of CO2 in my tent. I had no continuous air exchange so once the plant started getting to a decent size, the new growth started growing in yellow. During those grows, I had my exhaust fan (AC Infinity T6) completely off most of the time with triggers to kick on when the humidity or temp reached certain levels. Now I have the exhaust system set to a constant flow (currently at speed 2 out of 10) with triggers to ramp up to 8 when temps or humidity spikes to high or low. Now the the yellowing of the early growth has stopped. Clearly, I'm no expert, so this is all bro-science and speculation, but I'm pretty sure the yellowing was due to the complete lack of CO2.