Hey Chris seedlings cotyledons turned yellow and died ( Skywalker OG ) this day 16 after seedling broke the surface. Plant under 300 PPFD or PAR ( MQ 500 Apogee meter) at 24”. Soil mix 1/2 happy frog 1/2 ocean forest in quart air pots. Tent temp avg 83* RH 55% to 65%. Using RO water ph‘ed at 6.30 . What do you think , am I worrying about nothing.