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OK, here is the promised follow-up. Let's begin evaluating, take it for what it's worth from an anonymous source on the internet --based on bro-science (50% facts + 50% magic) 😂 I noticed in the video you are into DIY fixing, so if you want some more quick DIY stuff you could push your RH up just a notch. 49%RH at your current temps is OK, but you could probably push it to roughly 55%. As you got a solid setup already I'd suggest that you upgrade your "watering can RH-enhancer" with some high-tech-RH-modifiers a.k.a --moist towels, or some vessels with high surface-area filled with water to increase the humidity by passive evaporation and hopefully lower temp a little bit too in the process 😂 You got plenty of space in your tent, use it to your advantage. By the looks of your plants you got the early-weeks low-light-issue taken care of and now you have to deal with the responsibility of having mini-sun in your tent. It might sound counter-intuitive, but by having high amount of light you might have to lower the amount of dissolved minerals in the water as high temps and high photon density means the plants need to use more water from the soil to keep cool and if said water has abundant nutrients in it, said particles will be deposited in the leaf-tissue and cause jagged edges of the leaves initially, then develop into dry deposits resulting in ugly dead spots. The middle plant with tight internodal space show signs of what I'd interpret as slight stress from too much light vs high nutrient to water ratio (jagged leaf edges) bit high EC, that will probably develop into brown spots if it isn't taken care of, resulting in damaged leaves in the oncoming weeks unless you cut back some on the total-dissolved-solids in her drinking water. At the moment you are red-lining her w/o reaping much of the added benefits of more grow-juice in the drinks and for every week of redlining you will inherit the previous weeks problems and add new ones on top of that. You could also lower the amount of light hitting her, but I'd prefer to keep the light output as high as possible and just increase her water to nutrient ratio. As a rule of thumb --if it's just jagged leaf edges I normally just blast on, but if it develops into bleaching and or deposits in the leaves I deal with it by lower EC and bit less PPFD. The left plant probably just need to develop it's roots a little longer. The plant to the right seems to have just the right amount of light hitting her and are able to utilize the resources into healthy growth. I have nothing to add; she just looks dialled in and happy 😋 As you transplanted your babies pretty recently I admit my advices are more speculative than based-facts. I'm no grow-guru haha and most likely they will develop and grow out of any signs of not feeling well now if you just have patience & don't give them too much love (overfeeding em or blasting them with too much light or break them with too much LST turning into extreme HST) 😁 Know the outcome & you will see the journey 👊😁