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Light: Plenty of very bright indirect light. Keep out of direct sunlight.
Humidity: Average humidity is fine though it will benefit from frequent misting.
Water: Over-watering and under-watering can cause the leaves to drop. To identify the problem check if the leaves are crispy or if they fold easily. If they fold then the problem could be over-watering, and if crispy the tree could be under watered. Add enough water that can seep from the top soil to the drainage holes, at the bottom of the container and remove the left over water to allow enough oxygen to the plant roots. Less watering in the winter.