Jimmy JazzCabbage

This was a hell of a week. This is my first time running coco and here is my struggle. Day 10 - I started to notice yellowing in the center of the first true leaves. I didn't think much of it as it was more lime green than yellow. Day 11 - I was running under the assumption that I had over watered my wee little girl. So I added a humidifier to get the RH to mid 70s. My thinking was the roots aren't ready to take water from the medium so the leaves can pull water from the air. I also set my light to max (still at 28") as my wee one was stretching. My temp was 28°C Day 12 - buy now I'm freaking out. I write a question here asking for help and I'm scrambling. I brought my lights down to 20" and dimmed to 60% as per the manual. I also removed the humidifier in an attempt to dry out the coco faster. By now I'm reading that it's super hard to over-water Coco and that your coco should never be dry. So I added some clear saucers under the pots for a reason I cannot remember right now and went to bed. Day 13 - on this day I said fuck it I'm gonna water this girl and see what happens. I thought I would give it a good shot so I did 250ml of water, added Blackstrap Molassis and Epsom salts. Now I'm under the assumption I'm lacking Cal-Mag. Watering with Epsom salts gave me the Mg. Lastly I added pot elevators. Day 14 - happy day as today the yellowing was much better and green coming back in the second set of leaves. Then I opened the tent and saw little flying bugs. Possibly fruit flies as my kitchen has had some lately. But either way I Sprayed the plants with an organic spray and let dry for 30 min then out back in tent. Temps have been holding steady for days at 25°C - 50-55 RH. Night time temp stay around 22-23°C Day 15 - Today, she is growing, and leaves are stretching out. I watered again at 500ml straight water and top dressed with Oyster Shell flour (Calcium) and Diatomaceous Earth for pest control. Lastly my exhaust fan speed controller and ducting arrived so my ventilation is now complete. Till next week, happy growing all. Cheers 🍻