They Are very sensative to varied temperatures, movement, to much sun, not enough sun etc. Just put it in reasonable sunlight (window) Keep the soil wet all the times, and just dont move it much. Either way if in a good set, the leaves will fall off for some time till it settles in. Then with plenty of water it will replace all lost leaves and grow in full. a good setup will actually require trimming to keep tree in shape or thin enough within, for Chameleons to wander along its branches.