Droopy yellowing leaves

Дай удобрения для Веги, желтый цвет, требует Азот.

They haven't been in a humidity dome for a long time now. I have a humidifier inside the tent as the ac I use to cool the room (that the tents in) makes the air super dry. Guess I have to wait and see

I've been using rain water as that's what is being used also for my outdoor garden, all plants are healthy there. Therefore I didn't think it was a pH issue Leds are 50cm from the plants on 70% intensity. Humidity around 60%

I would say, that if you left a "humidity dome"/cover over them, that they have been "cooked", especially if there were no holes in the cover for the hot air to escape through. Cannabis does not need "humidity domes", it is not a rain forest plant and apart from the risk of cooking the seedlings, it can also lead to fungal problems due to the excess humidity, fungal problems like "damping off" which is fatal. I have been growing cannabis for 35+ years and not once covered any seedling with any sort of artificial cover/humidity dome, and this includes every sort of growing environment you could ever think of, from under lights to outdoors in hot sunlight and everything in between. The only time cannabis needs extra humidity is when they are taken as cuttings/clones, as they do not have a root system for a few days and the extra humidity stops the leaves from drying out to crispy dead. I would suggest leaving them uncovered and giving them a dose of half strength seaweed tonic, this may just save them, but if they don't show any improvement within 5 days, planting new seeds might be your only option. Hope this helps, Organoman.

How far away is your light? And how often and how much do you water? What range is your ph? Woud love to help mate, and if it is easier, you are welcome to write in private. Best of luck mate.

Not sure if it’s the lighting, but looks like it could be “dampening off”. Or the ph is WAY off. Humidity? Ph? Unfortunately, damping-off can happen very quickly. Many times, a seedling can go from looking healthy to dropping dead in just one single day. When this happens, it is already too late to do anything since the fungus has already infected your plant and there is no method of recovery. However, you can learn to spot the signs of damping-off in order to prevent it from happening again. Among the signs of damping-off include small white spots at the lowest part of the stem, just above the soil line. In this same area, the stem will look weak and thin, featuring a darker colour. If you spot these signs and the seedling is still upright, it is only a matter of hours until it will tip over.