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I think I figured this out...Once I placed the rooting cubes into the 4 inch blocks, my roots were too hot and had less chance to breath...at 87 degrees, I think this was causing the yeloowing of the leaves. After several days of lowered root temps and adding a healthy amount of H2O2 to the...

Hello all, new to posting, but long time lurker here. I have 3 three-week old seedlings growing in 4 inch rockwool cubes under a 200 watt CFL. I am using the 3 part Advanced Nutrients formula, equal parts of each, with a strength of 400 ppm (measured with Hana TDS/PH meter). I also added...