I am new to Calathea and got this beautiful Calathea Vittata about 2 months ago. It started getting these brown spots on multiple leaves and I’m not sure why 🙁 I’m watering with distilled water (I may have forgotten a couple of times 😢). Also using a humidifier. It’s usually on a north facing windowsill which in NY is getting a little chillier so I might move it to the center of the room. Would appreciate any advice people can give!