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Done? 1 week? 2 weeks?

So I have 4 white widows from crop kings seeds which I cloned from previous plants grown in soil with 1 450w viparspectra and 2-250w viparspectra LEDS, temps range from 75 during day till 65 at night, humidity during flower has hovered around %40, I feed gh flora trio about 1/2 strength...

So if been having this issue for a month. Leaves on top of canopy start yellowing and then turn purple from the top of the leaves and works in and from the top of the plant down. I thought the issue was soil PH but I changed my soil and no difference. My environment is ideal. TEMPS- 63-75...

what could cause this?

This problem didn't start untill I transplanted into 7 gallon air pots. I used leaf litter soil conditioner/compost with peat moss and perlite and some garden lime. I feed GH FLORA TRIO every other watering. I did a flush of the pots even though the issue started about a week after transplant...

Does anyone have any experience with heat, wind from stationary fans blowing straight down on canopy ( they are desk fans hung next to my lights pointed straight down) btw now thinking about it the air is probably pretty warm because the fans are hung right beside the heat sinks from my LED...

So I have 4 white widows which are about 2 months old from day 1 of clone including the 7 days they took to root. The are very healthy and green and bushy as they were monster cropped and I feed gh flora trio anywhere from 1/2 to full strength every other watering.They are in soil that i mixed...