Curlde leaves ( info's for past question)

Sheesh, plastic pots...... At night, all night, the plant.......on underside of each leaf has tiny mouths called stomata. These are responsible for releasing moisture back into the air as the plant processes all the nutrients and energy collected during daylight. In order for this process to function correctly and efficiently there must be a small breeze present in order to draw the moisture away from underside of the leaf. The moisture vapor released under each leaf will stay there until air takes it away, each leaf that does t have the moisture aired away will cease production as no additional water can be expelled from the underside of the leaf until air takes it away, either via light breeze or negative pressure suction force. At night if we allow the moisture to get above 65% regularly you are really asking for trouble in a indoor grow imo, at 70-75%%+ the plant starts to close it's stomata in order to prevent "drowning" from the wet air. This massively restricts the plants ability to perspire meaning it will only process a fraction of the energy collected from The day b4. Plastic pots and 75%rh, may as well call it a day already, if you got those rh levels in veg, flower will be alot more difficult to control. If the plant is not able to get rid of X amount of moisture in those plastic pots in X amount of time before you water again. Leaves get heavy tips curl down, laden with moisture, nutrient uptake starts to become effected as water is the Amazon delivery guy, water is his truck, nutrients are his packages,someone on the nightshift drove his truck Into a ditch blocking the road, reducing efficiency dramatically. If any part of the manufacturing process is crippled to 30-40% of total output then the entire process across the plants day/night cycle is limited to that 30-40% of potential based on environmental factors. Production slows. Nutrients not being used up remain in soil. Your feeding schedule is based on the expectation that X amount of nutrients are used based in demand of environment. In order for this to happen there needs to be the expected amount of work done Inside the plant. Plants look healthy, get the water flowing properly and you will be fine.

prolly environmental - wind, heat, light etc like others said. you'll have to eliminate possibilities. i also think you could slightly increase your overall fertiization. However, if these are pictures taken under grow lights, it tends to make them look paler than reality and lushness of plant might be perfect. You'll have a much better assessment of color with your eye and using normal lighting. Even ripples in leaves under intense light can give false positives about color seen. Sometimes you have to flatten out the leaf not to be deceived. At the least, the plant partially pictured at bottom of second picture clearly needs a bit more N based on the symptom pogression on the lower leaf barely in frame.

Heat/light stress would be usual suspect. Plants look hungry to me though

The slight curl/cupping of your leaves is pretty minimal and I wouldn't overly stress it. It could be from a little heat stress ot maybe your getting too much direct wind from the fan. Dunno at what ratios you're feeding, but you're probably ready to step up to a little more aggressive veg schedule. Your plants are turning a little pale.