I think that the plants need more light. Yes, I would try to harden them off now and place them out in the natural light or get these up close to your light source. Natural light is always best. I would give them a dose of Epsom salts at your next time for feeding. The plants look to be very wet. The surface should be dry to the touch. I also think that I see some rot on your Unknown Off and perhaps another in that shot. I would suggest giving the plants less water. When you do re-pot these, plant them deep and bury the stem well. Do not re-pot until you can give them adequate light or they will just remain tall spindly seedlings.
In re-thinking your growing chambers, perhaps it would be easier to have this out in your greenhouse and instead of cooling the chamber, heat it. That way you can start your plants out there in the cold of early spring, have natural light and enough heat to prevent them from freezing.
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~ Patti ~
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