Your ph is fine man. And there isn't such thing as too much light... now there is such thing as not enough light. When your 3rd set of leaves come in... you can start feeding your plants with seedling feed... and by a week later you can change out your nutes... be sure to flush you plants hydroton each week and then start feeding the early grow feed, by the next week you should be able to feed the next step up on your feed chart on your nutes. Seedlings don't need any food really till after the 3rd set of leaves.