3 high Society looking sick

At first glance, it looks like slight overwatering, but it could also be low humidity... basically, I have to say that your plants look absolutely healthy, and while your concern is valid, it's not necessarily urgent! Good luck 🌱💚

Hello mate, i think they are in overwatering and also your humidity level is too low, this cause a VPD level wrong for the vegetative phase. Try to fix these things and you will see your plants with power again. Good luck and happy journey!

Check the surface of your medium if you're having problems with fungus gnats. The gnats live in the top few centimeters of the substrate, where they breed and hatch. If the surface is covered with 1-2 cm of perlite or even better, quartz sand (they don't like sharp edges), they can no longer breed in your substrate, as the surfaces dry out quickly and the larvae need moisture. Regarding the vitality of the leaves and your notes in your diary, I would guess ultraviolet and 01010111… are right, overwatering can also deform and droop the leaves, always let the roots dry out a bit so they can breathe oxygen. For starters, a humidifier is always good, later a dehumidifier makes sense when the plants themselves transpire enough to keep everything in the green range. If you want to be precise, a humidity controller is also worth it; there are already affordable ones for about 30-40 euros on eBay. Here, the vapor pressure deficit (VPD) between the leaf and the room helps you, which is essentially an expression of your plants' transpiration. If the VPD is outside the range of 0.4-1.6, either no transpiration occurs due to oversaturation of water vapor, or it is so dry that the plant closes its stomata, slows down or stops respiration to protect itself from drying out, which would be the case for you. With the deformation, it tries to reduce the transpiration area; the plants are still very small and react very sensitively to dry conditions at this growth stage. Here’s a table where you can read the correct values: https://images.app.goo.gl/Yy68mZsngq2qLroo9 Be careful, there are different tables for sodium vapor lamps and LEDs because LEDs emit less heat and warm the leaf surfaces less; the tables estimate the difference between leaf and room temperature. With a pyrometer, you can calculate everything precisely if you want to take it to the next level. At 28 degrees, it would be 75-80% for NDL, rather up to 85%.

I'm also thinking it is more to do with environment conditions. Increase rh a bit.

"Tacoing" (curling of edge of leaves) probably from temp/rh. The plant will be more robust as it ages. 82 / 57% Leaf temps are a bit cooler than the atmoshphere, but even reducing from the listed 82F, you are still around a 1.5 VPD which is high for vege phase and even a bit high for flower phase. The droopiness is probably from poor drainage quality of substrate. 9% perlite is not enough. with a high water capacity soil, you want around 50% perlite. This will make it nearly impossible to drown roots after an irrigation. You'd have to run water through it for 10minutes, lol. Easy to rule this out.. does this occur when you irrigate or all the time? do you have hints of pests? yes, something chewing on the roots could make them droopy, too, but you'd see evidence of their presence. Easy to rule out.

Excessive heat combined with low humidity (high VPD) can cause stress to cannabis plants, causing leaf curling as a defence mechanism. Cold temperatures and high humidity (Low VPD) can create a breeding ground for fungal diseases. This can also lead to curly leaves and other stuffs.