Help leaves are dying pics included

Sheldonblack2800

Active Member
Hey there! I noticed some of the leaves on some of my plants are drying up and dying. It’s like starting on the outside and working it’s way inward. Some of the leaves are worse than others. None of the top leaves are affected, only middle and lower.

I water with reverse osmosis. I use advanced nutrients ph perfect. Every time I mix my nutrients the ph of the water going in is between 5.4-5.6. The runoff ph is 5.8-6.2 and 800ppm. I feel like I haven’t been feeding it enough because according to their calculator I am only feeding like 40% of what they recommend. I just started giving them more cal mag also as I was barely giving them any.

I feel like the tops are fine just the lower leaves idk. Is this a deficiency or? Maybe phosphorus or cal mag no idea.
 

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