i spent 10 mins writing a great reply and the internet died along with the post ffs. anyway here it is in far less detail, bullet pointed:
- i am growing and have grown at the same latitude as you in the uk and have a coupla babies germed at exactly the same time as you
- wait a couple of weeks until you use nutes.
- the early problems were almost certainly caused by pulling the seed off - its a classic mistake i made my first time. they need to push it off on their own so they can adjust naturally i guess.
- get them in bigger pots when they are approx 1/3 the height of the soil level - most growth is in their roots atm. my first grow i waited far too long and they were rootbound; when i pulled them up after harvest i found their roots had remained in the same little pot area and so all my nutes i gave them in their water were mostly useless as there were no roots the lap them up outside the little pot perimeter.
cheers and GL