My first legal grow in germany 🇩🇪

So all of my seedling spread nicely out of the soil except for one Liberty Haze so i looked after her and she hasnt build any roots. So i but her in my mini greenhouse and hope she will then get some roots. The biggest problem my plants have is that I take too much care of them because of my impatience. Thats the reason for left OG Kushs lack because i thought the EC level in the soil was too high and i flushed her a bit to much i guess.. I poured her canna terra vega today we will see if she recovers. I have a little bit low tempertures at night because my tent is in the cellar. Do you guys think this is a big problem? My humidity as well is a little bit low so i let the flushwater stay in the box, i know this is not the best way but i have no money for a humidifier at the moment. If this is a big mistake, let me know. Update on day 6: Finally my order arrived after 14days.. I repotted my plans now in 2L Plagron Light Mix so the next two weeks i should have my peace of mind. The weak og kush flew out because the smaller one overtook her. I added two Zkittles Zi Zi in the report wich are growing well.