You need UVB AND UVA.
To add to Brad's post you need to repot the plants. The white bits in the dirt of those plants will kill your cham if eaten.
Powersuns are a bit intense for a chameleon ESPECIALLY sitting on top of the cage like that. Your plants will grow in time... but in the mean time I would try hanging some fake plastic plants around the sides of the cage to give your cham something to climb on (instead of the screen) and some cover so he isn't stressed by seeing people.
And yes... remove the money tree... If you can come up with a well developed pothos, you can hang it's vines around the cage for more climbing pathways.