You need to supply more parameters to get specific advice:
1. In order to survive indoors, most- but not all- trees need some time outside in a reasonably high-growth (relatively high growth) position. Has this critter been indoors since you bought it?
2. To all things- a season... autumn is not a time for growth. You would expect to see a change in the growth/life of any plant at this time of year. For instance, bring a Christmas cactus in now and watch it blossom, or bring a critter in from full sun and watch it drop its leaves (this can be ameliorated). You say your Box has been in a few locations. Where, and when, and how long, and of course why the changes?
3. In houseplants, browning at the edges of leaves are typically a sign of over-watering. Often, the brown edges of the leaves will have a droplet of water almost contantly present. In concert with your answers to the above 1 & 2, are your watering habits different from your “summer” habits? All other things being equal, with lower transpiration rates should come lower watering rates. Is your plant receiving less sunlight than in summer? Are you watering on a schedule rather than responding to watering when the soil is dry to the touch?
I can’t speak for others, but I view incandescent lights as better for dehydrating jerky than illuminating plants. Put your hand, or better- the back of your forearm the same distance from the light as the plant is. If your skin is uncomfortable, stop, forthwith. Buy a cheap shop light and do the same thing.
I don’t understand how you can water from the bottom and see deposits on the top of the soil. That tells me you have a high salt content in your water. Is this possible? Something doesn’t ring true here. Are you using untreated well water? Are you in the Great Plains (US or Canada)?
