Over watering?

Awesome setup bro 👍 I'd hold off on the food and fix the pH, I'm no expert but that's what I would do. To the extent of flushing then transplanting...my RH has been around 70-80 and they've been thriving. Get a soil test kit and fix your pH. Your environment is perfect 👌

I will not cut the yellow leafs. I will flush them and adjust the ph and humidity properly. Ph in 5,6-5,7 it's ok, and 60-70% humidity. What is your EC? Im a newbie, but i recommend you to see my diarie, i also had issues and they gone just doing the right fertilizing with the right run off, ph and ec. In fact i now that because someone enlight me in my first question jaja

I don't now anything about soil, but with coco PH 7 is a no, no, no. As much 6 in the last weeks. Now im in the 7 week with 5,8 - 5,9. In the week 2 my ph was 5,6. I dont want to be rude, but if you had a diarie, others could answer you better. Happy grow 💚💚

Using coco The plant stopped growing for like 4 days and the bottom leaves are turning yellow. Should i cut them off and flush them with plain water?

6.0-6.4 for pH as well. 7 is way too high for seedling, and in general, the whole process. I don't go above 6.5. Humidity is fine for the seedling at this stage.

I can't see your diare, do you have one? Maybe if others csn see it, it will be easy to respond. What are you using? Soil or coco?. About the humidity, i think that the right humidity in vegetation is 60-70%. I dont know too much, but at least that's what i do in that week and they were fine 😊 you can see it in my diare. I hope that your plants gets better 💚