I received a bonsai ficus tree about 2 weeks ago. I don't have much experience with caring for plants, but I would like to see this tree last. It says to keep it indoors, in a place with sufficient light and water every other day. Some of its leaves have been turning a splotchy yellow. A friend of mine says it's a sign of too much watering? Or could it be lack of light? I really don't want to kill this cute little tree!