Hello I have 5 potted mango trees which are indoor during the winter. Recently I have had a lot of leaves falling off the trees, some more than others. Also there were a lot of brown spots on the leaves, and I have sprayed them twice in the last month. Any ideas as to what is going on? Or what I can do the help them thrive during this winter? I'd also like to add that I have a metal halide and and working on an enclosure for them to regulate the temp and keep it around 80 degrees. I have not fertilized this winter although I do have a lot of tip (burn) browning. Also they are potted in a (Al's) gritty mix.

If you can give me any advice I'd greatly appreciate it.