Root rot usually results from a soil mix that does not drain quickly or overly frequent watering. Remember that when the plant is moved from a certain lighting location to another it is going to go through a period of acclimating. Expect the plant to thin out and lose some leaves. Do not place plants near air conditioning vents. Low light can cause leaf yellowing with spindly, weak stems. Leaf drop can be caused by excessive watering, by low humidity, or by drafts.
Medium to bright light.
Water thoroughly, then let the soil dry to 3″ depth before watering again. Never let a plant sit with water in its saucer. If you see leaves turning black and dropping off it‘s a good signal that the soil is staying too wet or moist. On the flip side the leaf tips wrinkle if they are too dry.
For optimum plant health, fertilize with an all-purpose houseplant food April through October, following label directions. For all other months, fertilize half as often.