Hey everyone! I'm wondering if any of you can take a look at the photos attached and let me know what you think I should do to save this medium sized Brazilian Rain Tree.

I noticed some yellowing of the leaves about two weeks ago, and left the tree out in the rain in hopes some of the minerals from the rain might help him out but it looks like the tree is deteriorating more

Three photos attached are in normal sunlight and two photos are under the grow light where the yellowing can really be seen. Thanks for the help!!