Today I "replated" almost all of the seedlings, selecting the largest darkest green seedlings for replating. Replating is literally scooping them out of the vessel and placing them on a plate then transferring them to vessels with fresh media.
They were replated because I noticed the growth slowing down, almost to a halt. Hopefully, I have carried out the replating in time. This is the step that has the most chance of introducing contamination, so I used several vessels to lower the odds.
The slope in the media is deliberate so that the condensation runs to the low side and does not puddle and drown the seedlings.
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