Too much light for seedlings, start them under a much smaller light. You shouldnt be using soil in a dwc system, use rw cubes to start next time. Also are you using H202 in the res every 4 days to stop disease ?
There is G13 then there is the rest. Unbeatable in size quality and strength. Strongest dope ive smoked . Easy to get a pound a plant. Here is double d's g13 grow.
The soil is causing the yellowing and final weight drop. Use coco made for growing dope indoor usually about $40 a bag from the hydro shop with hydro nutes every watering and your leaves will stay green untill harvest.
Once i changed to canna terra from soil i couldnt believe the difference.
You will have to wait. Very small for 1 month old, bad medium for dope. Water with N thoroughly till run off not just in the middle then dont water till pots light to lift.
There arnt really any 'final steps' just harvest when you think its ready and watch for mold, yellow/brown leaves growing out of a section of the cola where the rest are green is almost certain to be mold in the centre and will get worse.
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You can get away with no air cooling with a 400, just exhaust the room.
No its not N toxicity its the opposite not enough N. Dont go adding more to correct it , you will only make things worse. Flush, get the ph to 6.5 with adjusters then feed it hydro Flowering nutes.
When you throw a mix together like that in a pot your just guessing unless your very exp and dialled in,too hot wrong ph high salt build up poor drainage to name a few with random soil mixes. You want to get it spot on right from the beginning? Use this, no ph adjusting and a kid could do it...
Its not the lights that's for sure. Clones should always be the same as the original mother plant but genetic drift can happen especially with what you are doing ,a clone from a clone from a clone and so on. Had you have taken clones from an original mother the clones would always be an exact...
You will have to use air cooled lights as well or it will be too hot later in the year.
Instead of hydro with noisy pumps, big res full of water that needs emptying every 2 weeks that could spill and get just as good results if not better from pro quality coco made for growing dope and hand feed.
Yes you should and you would only re use it if your on a tight budget. Reasons being , salt build up residue in the old medium, gnat larvae other bugs , leached out etc and also you should only have the best when growing dope no cheap alternatives. New soil, new rw floc or new coco for best results.
Overwatering and poor quality mother plant. You only need the cubes 50% wet at all times including the start. When you water only dip the corner of th cube into the water, dont saturate it and push out all the air.
Try to keep mums healthy,green and vigorous.
Also when you put the cutting into...