Ok, so i bought an Indoor Bonsai this year, just at the end of winter, it came with a little book with basic info in it, pruning sissors and bonsai food. The book told me to water the plant either using rain water (which i don't trust as this is a big and busy city and the waters not very healthy) or filtered boiled water thats been left to cool with the recommended amount of feeder, and so this i have been doing. I have also been misting the tree twice a day with cooled filtered boiled water. I keep the tree on a cupboard directly facing my window (im not sure of the direction its facing), and it has between 2 - 3 hours of direct sunlight a day and its faily drafty as well. Now my plant has developed a yellowish crystal-like growth on the trunk and the leaves have started to fall off. I have had problems with the leaves going yellow and brown, but there are still new shoots coming through. Please can you tell me whats wrong and how to make it better!?