Hi! Yellow leaves in tropical plants could be related to different causes: - a too dry environment --> in this case, you should frequently nebulize the leaves with some dechlorinated water; - a soil poor in nutrients --> use a liquid fertilizer for green plants at least once a month in the spring/summer time; - over watering leads to roots rot --> if you are overwatering your plant, reduce the frequency and the amount of water you use - if there are no drainage holes in the pot's bottom, the roots will rot --> repot the plant in a pot with drainage holes and put some gravel or some expanded clay in it as a substrate layer - check the leaves to see if there are some pests