I don't recall the exact age of the seedlings since these seeds were started later than my main batch but I think they were around 3 weeks old. They were primarily peppers (although some tomatoes show similar signs) and were about 2" tall at the time.
The ones that show it the worst still have purple leaves and have all but stopped growing. They have probably put on 1/4 inch in height in the last 3 weeks since this was done. Very slow growth rate.
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