Help. Leaves on young plant curling downwards

Your growing in coco.your having ph troubles and moisture troubles. Coco stays wet all the time. Ph in and ph out 5.8 in vegging. Flowering 6.2. Anything above or below those 2 marks the roots will be in lock out. Thus plant consumes itself to survive. I been growing autos in coco for some time. You can not overwater in coco perlite mix. Unless under a 24/7 stream of water and left in run off. My guess is ph, then light intensity, and possibly nutrition. A really low run off means it is too strong. Once you get your ph right in coco your nutrition will hold your ph value if in right amounts. Too strong ph drops. Too much ph rises in your run off anyway. Coco is hydro in a potter if that makes sense.