My seedling is 7 days old. I am growing in a DWC system with hydroton medium and General hydroponics trio. 1 1/4 tsp flora gro, micro and bloom. ppm is 500, pH is 5.8, temp is 28, humidity 65%, using a mars hydro ts 600w 30 in from plant. I also have a plant dome over top and have been letting plant breath for 10 minutes once a day. This is my first grow so please help me figure out whats happening and how to fix it. Thank you.