Help, yellow/browing leaves one week into 12/12

Hi my plants need some help and I am not sure what to do next. The strain is OG Kush which vegged beautifully under 2x125w CFLs but ever since switching over to flowering have been having issues. I am using regular GH nutes with just a dash of DM-zone, when I switched over to 12/12 I was using the recommended amount that was on the back of the bottle for the transition to bloom phase. I am flowering under aircooled 600w hps with correct ph in dwc buckets. on 1/28 ppm was 1380 I have since flushed and lowered to 1170 on 1/30 with no improvement, also raised up light at that time. Today I flushed once again and lowered ppm to 867 and raised light to highest possible position. Please help, Is there anything else I can do? They seem to be getting worse ever since switching to 12/12 and moving under the new light.

FLUSH real good!! until you get tired of it... then fill your buckets with a solution mixed as following: 5ml micro 10ml bloom, and 5ml Calmag+ per Gallon of water check PH is stable (5.8-5.7), top using 5 ml of grow and 5ml of Calmag per gallon and repeat treatment for a week.

yeah...they just have too much nitrogen...I often have this issue.

what?

i agree theres an overabundance of some elements, but not nitrogen. nitrogen over-abundance is DARK leaves, like a hunter green almost black leaf. coiled over leaves that appear as old scary lady hands. id guess this is a micro nute problem.

i would water with plenty of fresh clean water (not flush just water til theres a good amount of run off), give it a week, then start over with a lighter chemical make up of the fertilizers. keep upping the dosages til you see a little issues, then go back a step or two.

maps84 said:

5ml Calmag+ per Gallon of water check PH is stable

Click to expand...

I agree with this, and would add that 5.7-6.0 is acceptable. This most assuredly seems to be calcium deficiency, though I see no indication of burns.

Thanks, I will have to run to the local hydro store first thing monday and pick up some Calmag+