Yes, I believe hydration and natural sunlight help a lotReal plants are best, but right now that is one of the lowest priorities. If your little guy pulls thru (and I’m praying that he does), it would be best to go thru all of your husbandry.
I seem to recall something about natural unfiltered sunlight helping to push supplemented Vitamin D out of the body. I’ll have to try searching for that. @ERKleRose do you know about this?