Leaves yellowing in second week of flowering

Soulrust

New Member
Hi,

I have a small grow room with three females growing in coco. I put them in 12/12 cycle last week.
One of the plants was always bigger than the others, about 3' 2" now, the other two are a foot lower. The two smaller ones have started yellowing quite a bit, on all the big fan leaves but the top ones. One is worse than the other. The top leaves seem fine, as well as the smaller leaves/branches growing from the stem, but on the worst plant, all the fan leaves look really bad.

I've had some heat problems that have caused the upper leaves on all plants to canoe a bit, but this hasn't caused the biggest plant, which is much closer to the light, to yellow at all, so I don't think that's the problem...

Growing in coco, watering every other day, alternating between plain water and nutes (GH Micro + Bloom, CalMag). PH'd to roughly 6, hard to be exact as I use indicator fluid.
400W hid light.

Distance from lights is about 10" for the big one (which looks healthy) and 15" for the smaller ones (I have them propped up).

Attaching picture of one of the worst fan leaves (sorry for hid interference, but color is light green to yellow).

Any suggestions?

yellowing.PNG
 
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