Everyone said what to do but didnt say why. The plants are over fertilized more than likely. Leaves curling under is a sign. What kind of soil are you using? Have you checked the ph of it? If its not between 6-7 then then you will have to counter act with the ph of the water. I would do like everyone suggested with the flush. Then after a week or two I would start back with the nutes at half of what you have been feeding them. Let us know how it works out.

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