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Looks like a moisture issue. If you can, get a moisture meter. You will have an exact reading. At this stage, You want the roots to stretch and search for water, but it sounds like your letting it go too long. seedlings can require water daily. You could be over watering, but those containers...

I vote that you remove it. For the room set-up, Jorge's book does say that. I thought it also went over the sensitivity the leaf undersides and stomata have for light, but I could not find a page number. I would be careful, It is 'unnatural' to reflect light upwards, the sun doesn't do that...