Blimburn Indoor Coco #1

I've had my one plant look like the 2nd pic in your question. The temps and lights where fine, I'd say this is more of a PH issue. granted the canoeing of top leaves tends to be light and or heat stress. Your diary says your running a PH of 6. That's on the high side for veg in hydro. I'd try lowering that down to 5.6-5.8 then back up aorund 6.2 in flower. your PPM is also a bit high for week two. I'd try lowering that down by a few hundred and then raising it slowly in the next week. the GH trio line runs hot from what I've been told. Best Of Luck!

Begining of nitrogen toxicity, cut back on nitrogen now that they are flowering. Also, always post pictures taken in normal light, pictures under grow lights are next to useless for details.