Like
@Captspaulding said, that was too much light. It might still be. I hang LEDs at the top of my tent, and start the dimmer at 25% of anticipated finishing intensity. If I see light stress (edge curl, taco-ing, twisting, any color other than vibrant green), I reduce the light. Without knowing what your media is, it's hard to recommend a watering frequency. In soil or amended soil, I water slowly to saturation, only when the pots are very light. Feeding depends on your starting point...if you're in amended soil, I would be giving water with
calmag for every watering, and tracking runoff ppms to see when to feed the first time. If you're in an inert media like coco or peat, you should have fed for the first time already.