The seedlings are under cool LED lights, so they don't get alot of heat that way.
The ambient temperature of the room is 70 during the day, but 65 or lower at night .
I've checked my seedlings again and the little dwarf seedlings are all green; the biggest seedlings (indeterminates) all have the purplish undersides. The middling seedlings (hybrids with an average mature height of 3 feet) are a mixed lot: some are all green and some have the purplish undersides.
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