i assumed it was probaly over/under watered, i had another plant that had the same problem and i moved it into the greenhouse outside caus there was good weather and watered it like once every 2-3 days and its fine now, put it back in the wardrobe then. im using rain water, no nutes yet. 25% pearlite, 35% soil/muck from my yard, 5% sand, 35% compost. The light is a shit cfl and a tube floro, i ordered lights of the internet around 2-3 weeks ago and der was a problem i guess, but should be reciving shortly. 25-28degrees celcius usually. dont know the Ph?.. and i was watering them once everyday but started watering every 2 days but not much. Hope this is good enuf.
Also if you look at the picture, you might notice how skinny the bottom of the main stem is, whereas the top is thicker, i fear that this might hinder its growth in the future.