Hello! My Chinese money plant has been doing so amazingly ever since I got it a couple months ago, but if you look at one of the bottom leaves in the right picture, it has turned completely yellow and developed brown spots! What does this mean? This plant is always in my bedroom window and hasn’t seemed to have a problem, but is it too much sun? Should I remove the leaf? The soil seems to have some discoloration. There are NO pests of any kind, I make sure to water it whenever the top couple inches of soil is dry. The other left picture is the full plant, other leaves for comparison. Thank you!