Hi Will,
Thanks so much for replying!
I bought it already potted by the nursery and it looked fine when I got it. It looked fine for a few months before starting this drooping!
The brown balls at the surface are only about half an inch thick. They act as a kind of mulch. The pebbles you see along the perimeter of the surface are only aesthetic and are only around the border.
Oh...for the soil I actually followed a schedule of 15 - 20 days. Never really checked how dry it was before giving it water. The few times I've actually checked, the soil did not seem very dry but I assumed it was because of the fact that I had a layer of compost soil at the top.
When I water, I water it until water drips out the bottom.
That window is South facing.
Going by the answers to my own questions...could I have overwatered it? I never really thought that could be the issue because I was watering it like once a month! Surely that can't be enough for a huge plant like this?
Thank you for replying!