SOS! Hoping someone can help me work out what's wrong with my dracaena. The tips of the bottommost leaves have been turning yellow and then brown for months. Also noticing some ominous looking brown spots and discoloration on the main part of a few leaves. Not sure what's wrong! I started using filtered water (instead of tap) a few months ago and that seems to have helped, but the symptoms continue. Any advice would be much appreciated!