I have a Phalaenopsis that started a couple of spikes several months ago. They were growing very slowly and then the buds began dying. Now the ends of the spikes are also dying. See photo. (The burnt leaf in the photo is from last summer. ) It was in a NW window, back from the glass so as not to get direct sunlight. Now it's in a grow box with fluorescent lighting. Anyone have any idea what might be the problem?