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Check the PH level. It's important to have the right PH level to prevent marijuana deficiency and leaf symptoms. An off PH level can cause affect the roots and their intake of nutrients, in witch case the first signs are yellowing(nitrogen deficency) and curling of leaves.

How much sun are your plants getting, and how hot is it? Curled leaves can be from heat stress, try putting some shade cloth over your plant for a week and a half and see if it does better:)