Two comments. First, don't spray unless you see bugs. Second, the
plant doesn.t like being indoors. Where is it in the house?

It is in an area that gets lot of indirect light, close to a warm mist
humdifier (4 feet) and also an air filter (2 feet which is partly
directed toward the tree as the air is sent out in all directions).
There is an aritifical light source 12 hrs/day.