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Pink Fang Tomatoes!
(lemmy.world)
The one that didn't grow is on me, I had two seeds in one tray because I'm sometimes unobservant!
I'd stick a bright light directly above them, to keep them from getting too leggy.
Right now their little stems are delicate. Let them strengthen up a bit, and when you transplant them, you'll have more stem to bury, and send out roots.