My first grow DWC

If you a high quality air pump in your hydroponic system... It's very hard to "drown" a seedling.. Iv'e mucked around with a few flow rates.. I think there is a point of too much but if it's in rockwall.. and your not inputting water directly into the rockwool like I am.. Then your most likely bang on.. A lot of plant suffer because people in hydroponics are adding nutrients too early.

he is exactly right in my opinion... your light is not too close.. Your light could even go closer.. but just keep it the same height for a while and stop letting the water stay on the leaves.. The affected leaves will not get better and yup that's about that.

Really all depends on the final height you want and the amount of time you're willing to put in. For indicas, they will more than double in size after you flip your lights. Your 6 inch plants will probably top out at 15-20" if you flip now. Sativas would top off somewhere around 25-35" if you flipped now. Vegetative growth is much slower also. If you want to let your indicas hit 10" before flipping, it would probably take 1-2 more weeks of veg. Then 8-10 weeks in flower. It's worth the extra time for the extra yield if you can afford to wait.