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#1 and #2 seem to be chugging along nicely. #1 has had a reddish stem from the time it sprouted. The stems to the new growth seem green, so I assume everything is okay. The two larger seedlings seemed a bit yellow so I added some cow manure compost to the top of the soilless seed starter to support the stems as well. With that came fungus gnats, but I may have also been overwatering. The yellow sticky traps have snagged a bunch of them, but I still see a few flying around. #4 that I planted last week never popped above ground, so I germinated another which looks like it's doing well. Hopefully the 1.5 weeks difference doesn't end up making my canopy too awkward.
I watched a video where a guy had 4 plants of different heights. He raised the pots of the 3 smaller plants, each by different amount, to create a level canopy. That might help you if your 4th plant is smaller.
good luck with it all, I'm a noob so cannot offer more than 3rd hand advice and best wishes.