That is a vine that grows like a weed if given plenty of sunlight and fertilizers. I am guessing if you move it closer to the sunlight and put a humidity tray under it, it may help. They grow off the humidity mostly here and can get out of control if not monitored and occasionally trimmed back. I'm not sure where you live, but if you have a humidifier in your house that will help them grow faster and much nicer roots. You should be getting aerial roots also; if not it's probably the lack of humidity.