The amature's guide to low yields

I started with nutrients this week. I think the white widow runt was too fragile though and I'm pretty sure I damaged her by adding too many nutrients too quickly. She turned a bright yellow and continues to lag behind the others. I've had issues keeping the humidity above 50 so I've been periodically spraying inside the tent. I ended up adding a bowl of water, which seemed to help a bit. I think a mistake I made this week was not adjusting my light to a lower setting, I think it might be too strong for early veg, but I'm not sure.