Hello, I'm growing two Lemon g seeds in Rockwool in expanded clay pebbles. Ph is 5.8, EC is .2, temp is 65, under a mars hydro tsw2000 23 inches from plant. This seedling was fully opened yesterday and overnight it folded back into itself and feels hard/dried out. Otherwise the plant looks healthy. The other seedling was half a day behind but is still fully open. Temp in tent got to 78