Currylato / Kosher Kush / 24K

This is my very first grow! It's been a long time coming and I've finally taken the plunge. Growing in canna coco which was watered with a light feed of canna coco a & b and a bit of canna rhizotonic before transplanting germinated seeds into the pots. All seem to be doing fine so far (as far as as i can tell) and have only needed very light watering since being in the pots. Growing 3 currylato (one didn't pop), 4 Kosher Kush and 1 24k with the idea of choosing the strongest 4/5 and getting rid of the others. All being grown under a 240W QB LED panel from alibaba (Meijiu). The tap water where I am is quite hard (350-400ppm) so will do my best adjusting for that. Still trying to dial in my setup, temps aren't too bad however my humidity is constantly very low (30-40%). The plants don't seem to be very bothered with the humidity being much lower than I have read (60-70% for plants this age) so will probably just keep an eye on it for now and if it becomes an issue I'll invest in a humidifier (I have added a large saucer of water and hung a wet towel for now). Will try to keep this updated as best as I can so you can follow along and tell me where I might be going wrong! Cheers.