What is causing my Umbrella plant to wilt?

Common names make it hard to identify plants. How big are these cages? If your umbrella plant is Schefflera and the leaves are falling off, it's too wet where the roots are. These plants can become quite large and seem like an odd choice for a reptile cage unless it's about 6 feet tall. The main thing to remember about plants is: Right Plant in the Right Place. Schefflera like a lot of light, too. What are you growing them in, soil-wise in these cages? Below is a link to a chameleon site and they don't sell umbrella plants for the critters.