Hello, I am looking for advice to help my mum whose money tree plant appears to be dying. She has had this plant for over 30 years and it is incredible until the past couple of weeks. A while back she put a brass tray at the bottom of it to try and support the weight of it, but recently it is showing signs of dying. The leaves are turning pink and others just falling off everywhere and it's never done this. The tray has turned a green fungus looking appearance almost like oxidised and she is so worried the plant has been poisoned via the roots from the brass.
Can anyone suggest anything to try and remove toxins from a plant or a way to restore it? She is so upset about this so anything any suggestions would be appreciated.
Thanks in advance!