I have a dwc system with four seedlings going. I have it in a 4x4x7 grow tent with a led ufo and a two t-5 flueros. The seedlings are 1 1/2 weeks old and are on a low nute level around 300ppm or so. The ph level has been between 5.8 and 6.0 Today the leaves started curling downward and the inner part of the leaf towards the stem is turning yellow. Can anyone please help me this is my first grow and I dont want these to die.View attachment 1508945