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Are you in coco as well? I have grown in soild before and I had good results at 6.5 but in the coco it just took my babies and made them yellow

I am using RO water. I switched to 5.8 Ph because my plants were yellowing. I only switched the PH 1 day ago. So the problem existed before I switched the PH right?

They are 3 weeks into bloom

The reason I switched to 5.8 is that everything I have read suggest 5.8 is the correct PH for coco. I also spoke with a Botanicare rep and they also recommended a PH of 5.8-6.0 in their Coco. I don't have a PPM meter.....I know I really need to get one but I just don't have the money to buy one.

Sorry, but that should read....I just switched my PH to 5.8

I have a major yellowing issue that I need help with. Here's what my set up is.....1000W HPS, temp 80-85 daytime, 70 night time, 30-50% humidity (depends on the weather), coco, PH 6.5 ( I just switched to 5.8), I'm using 2.5ml per five gallons of Cal Mag, 5ml per 5 gallons of CNS17 1-5-4. I'm...