Div grows Toof Decay

I did an experiment to see how the seedling would grow closer to the light. I put a 6" tall box under the 2 seedlings I have for a few days and I believe I burned the leaves on 1 and stunted both slightly. The toof decay luckily doesn't show any signs of burn but it didn't really grow for a few days as it was fighting to stay alive rather than flourishing. Pots are lowered back to where they should be and we are moving on. Hoping for vigorous growth from here.