I’ve had my pixie arrowhead for about 1yr now. It was repotted 6mos ago d/t roots growing out the bottom. It is indoors and in medium indirect light. It has been great and thriving until the past week. I have noticed that it is getting a yellow leaf just about every day now. I know that they drop old leaves naturally, but is this a bit excessive? I have not changed anything. No new environment or watering schedule.