Hello! I am hoping to get some help figuring out what is wrong with a Dracaena Marginata that I've owned for about 3 years. I haven't had any problems with it until I noticed the spots on many of the leaves, mostly concentrated in the lower and mid-level of the plant. I've attached a picture for you to see what they look like. It is near a north facing window and was on a screened in porch during the summer (brought it in about 3 weeks ago). I use a moisture meter for watering and try to be careful about over doing it. Any suggestions or thoughts would be greatly appreciated!