Need help identifing yellowing leaves. GG4 autoflowers from ILGMI have Growing in coco useing AC Infinty self watering auto pots. In 3 gal fabric pots. PH 6.25, PPM 1050, 650w Nextlight mega at 100% 20-26" above canopy. Useing floramax nutes at recommended rate.
I have three plants in the tent all the same, two are progressing nicely with good green color, the third has been showing yellowing of the leaves, veins are still green, started in the middle of the plant. Strange thing is this particular plant is doing the best as far as bud production goes. I thought it was underfed so Ive top watered a couple times. Then I thought maybe I needed some calmag and top fed a couple doses of ph water and calmag. Im chasing my tail on this one folks and need your help. One out of three is turning yellow the other two perfectly green...im out of ideas.