So I have had this beauty for about 9 month now. Slowly but surely the leaves have been falling off the stalks, and not replacing them selves. So do I cut away the bare stalks or leave them be. And when the leaves start to go bad they get yellow spots and slowly but surely the whole leaf turns yellow and dies. Not sure if this is a natural shedding or something else. One more quick question, are those air roots or something else part way up the one stalk, the second picture?