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What is causing this? This morning I awoke and found one of my babies not doing too well. Brown spots developed overnight. Too much light or cal-mag deficiency or ???
– 12 day old seedling
– distilled water pH at 6
– water when dry a couple inches
– Spider Farm SF-2000 hung at recommended 24”
– organic soil with perlite
– no added nutrients
– light on 24 hours (too keep them warm mostly)
– humidity at 50%
– temp at 75 degrees
Suggestions would be greatly appreciated!

Update: 5 days later.