Hello
As you know, I'm new to this hobby. I went and purchased a money tree and a Chinese elm. I noticed that when watering my money tree, its trunk becomes orange. I don't know why. I also noticed that on my Chinese elm, the leaves have yellow spots. On my Chinese elm cutting, the leaves have black spots on them, and I'm starting to doubt that it's black spot fungus. Please see the pics attached below.
(First is the money tree, second and third are the Chinese elm spots and last is the cutting of Chinese elm with black spots.)