Please help! Very special chestnut seedling dying?

2 months ago

I am growing a chestnut tree from seed, its special to me because its from my grandmother's funeral. It was growing under grow lights in 70 degree basement and suddenly leaves started turning brown. I was starting to harden it outside for a few hours a day but not sure if its related since it gets worse each night I have it indoors. It started maybe 3 weeks after I transplanted it to a bigger pot with soil meant for container gardening. Any advice is greatly appreciated! And related question, when is it time to plant it outdoors? I included a photo of the setup I have!

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