I had one for 40 years, going from six inches tall to over my head and so heavy that I could no longer get it outside. It often had dry ends of leaves, but was very resilient. They can grow to become a huge tree, so it is too bad you can't plant it outside. Our conservatory has one over 100 years old. They have to take a chainsaw to it fairly often to keep it from going out the roof of the greenhouse. Mine had a ball almost two feet wide, so perhaps a repotting might help, but that pot looks to be plenty large enough for the time being. I do seem to recall that mine had pale leaves when they first emerged each year (indoors) but they became darker when it got real sunshine when I took it outside. Mine actually thrived on neglect, so they are a tough plant.
