Amnesia Auto & OG Kush in 2x2x4 Tent

SUMMARY: The lights are now on an 18/6 schedule after the first 2 weeks at 24hrs and I have also raised the lights up to 32" from the pot to help tackle the suspected heat stress and prevent the Amnesia from stacking as it is currently stacking nodes tightly. I am watering every 48hrs at 2.5L average input volume (pH 6.0) giving 28-32% runoff. I am irrigating every other watering as per the autoflower in coco nutrient schedule from growweedeasy.com. I have also started some low stress training on day 19. DAY 15 -------- Thursday 17/09/2020 05:00pm Mixed 5L of nutes and calmag at pH 6.0. Plants are looking ok with exception to the 2 leaves on each plant that look to be dying, presumably due to heat stress. The affected leaves look much worse today. Temps a bit lower since I removed the front insulation yesterday. Also, if it is a nutrient issue this should clear up now as I'm watering to runoff and will be giving the correct amounts of nutes now (week 3 of schedule). This coupled with the light schedule being corrected and ensuring temps don't exceed 30°C and I think the plants will be looking much healthier in the next few days. I have raised the light to 32" from plants as the amnesias growth is stacking with no gaps between nodes. I think they are behind in growth for day 15. [25°C/63%] DAY 16 -------- Friday 18/09/2020 08:00pm Both Amnesia and OG Kush first leaves dying off completely due to the heat stress and there are still early signs of it in the OGs biggest leaves with the tips curling downwards slightly with some discoloration. I really can't see it being nute burn as the feeding schedule is very tame and I'm ensuring to give plain waterings in between every feed. I've only just corrected the issues though (24/7 lights and high temps) and so it will take some time to show if its working. The plants were due for a feed and whilst none of the coco was dry, it was barely moist (check by inserting finger into coco right up to my knuckle and go by how dry it is at end of finger) and so I have given each of the plants 3L of nutes which has produced 1L of run off which is too much still. Next feeding I will give 2.5L of water as I know that 2L doesn't produce any runoff and 3L produces 1L and so by that rationale 2.5L should produce 500ml of run off which will be exactly 20%. [23°C/60%] DAY 17 -------- Sunday 20/09/2020 07:30pm pH'd 5.5L of water to 5.9 and gave the plants 2.5L each as the coco was drying out a little (still a bit damp). This produced about 200ml runoff from OG Kush and about 500-600ml from the Amnesia. Both plants still growing strong with OG kush towering over Amnesia though both have 3 nodes now. The second set of OG Kush leaves are still showing slightly browned tips which a curling down. Really not sure what it could be and will have to keep my eyes on it daily. The dehumidifier also hasn't collected a drop of water and so it would seem it's not working. I have set its level to 45% RH and will see if it works over night. [23°C/64%] Sunday 20/09/2020 08:30pm Interestingly the temps have shot up to 28°C since I watered an hour ago and set humidity to 45%. [27°C/49%] DAY 18 -------- Monday 21/09/2020 08:00pm The temps have been high today reaching 28°C by 12pm and 30°C by 03:30pm with a high of 31°C just before 06:00pm. Temp was still at 29°C by 08:00pm and so I have removed the insulation from the front of the tent and opened the tent for 15mins until the temps dropped. The temp is now 24°C and I don't expect it to get any higher though I have left the front insulation off to allow for a few degrees drop in temp over night. The coco is still slightly damp and although I was tempted to give them nutes I will hold off until tomorrow. I do wonder if I am mitigating their potential by not watering everyday, especially if you "can't overwater in hydroponic mediums" as I'm continuously reading online but they are both growing and whilst not completely without their problems they seem in good health. The OG Kush is huge compared to the Amnesia yet they are both at the same stage node wise. I will have to start training the OG in the next few days but I doubt the Amnesia will be big enough for another week. Also, the dehumidifier is working as it kept the humidity between 47-54% and it had collected a few mls of water in the tank however there appear to have been a few spikes throughout the day where it rose to 60-62% RH which I'm not sure why. I think you can only control the environment within a certain degree especially on budget equipment like mine and I'm certain my bluetooth humidity meter is not 100% accurate to say the least. I have increased the dehumidifier back up to 60% now that I have ascertained it is working to some degree. [24°C/58%] ALSO - They are starting to smell but only when I open the tent and get my nose close DAY 19 -------- Tuesday 22/09/2020 09:30pm I gave the plants 2.5L of week 2 strength nutes which provided 800ml runoff at a pH of 6.1 from the OG Kush and 700ml at a pH of 6.0 from the Amnesia so both are perfectly in range. This is still more than the desired goal of 20% runoff (500ml if giving 2.5L) and so I will give 2.2L of water next watering and see if that provides 20% runoff (440ml). I also started training both plants which was easier than I anticipated though I was overly careful none the less. Pics attached. [26°C/62.5%] DAY 20 -------- Wednesday 23/09/2020 I mixed 5L of Week 3 strength nutes ready for next feed (pH 6.0) and pH'd 5L of water to 5.9. Avg temp/humidity today [23°C/72%] DAY 21 -------- Thursday 24/09/2020 06:30pm The plants didnt need any further training today but were due a watering. Coco was again still damp throughout up to about 1 finger deep at least however I'm reading from multiple sources to never let the coco dry out and so I will always water/irrigate once every 48hrs at least. I gave each plant 2L of water but allowed 2 hours before checking for runoff. The OG gave 200ml (10%) runoff and the Amnesia only gave 150ml (7.5%) runoff and so they each require roughly 2.25L (2250ml) each watering/irrigation. [25°C/60.5%]