I have this guy hanging in a north facing window after moving him in from the greenhouse two weeks ago. Immediately after moving him in, he showed all this new growth. It was apparent that he was not happy in the full sun and heat of the greenhouse and preferred it in this spot indoors. But now, all that new growth is withering and dying. What might be causing this? He is in a cacti/succulent soil mix getting watered when he feels dry. (Approx. 1x per week.) I have owned this plant for about two months and have not fertilized it with anything other than about 5ccs of worm tea mixed 50/50 with water.