I am a first-time bonsai caretaker. I have put hours into researching and caring for my plant. It was given to me as a gift so I do not know exactly which kind of tree it is, but I can post pictures if necessary. It has dark green, round leaves with what looks like water stains but is not. Also, brown spots have been appearing on a few of the leaves, but not all of them. I have checked for bugs and sticky webbing underneath the leaves, but there is neither. If you could please help me, I would greatly appreciate it!