Hi all! I'm an amateur (this is my first bonsai) and I'm afraid I'm killing it. The tree is losing its color and when I touch it leaves fall off (it also feels very brittle and dry), and I can't figure out what I'm doing wrong. It's getting plenty of sun and water. Including photos of the sick tree and its healthy friend so you can see the contrast in color. Any thoughts much appreciated!! Sick tree: Healthy tree: