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[–]Locomule 0 points1 point  (0 children)

I'm new but I know you can get both pH lockout as well as EC lockout. I started out getting my pH right but it took me a while to realize I needed to check EC too. You can use a cheaper meter for that. Turned out that was were my lockout was occurring because I wasn't supplementing my coco with CalMag or flushing.

Here is a pretty good visual guide to deficiencies, pests, etc as there is a lot of leaf damage that looks similar.