Hi Lija,

Thanks for the response. The vivarium is glass except for the top which is mesh. There's a basking light and a 2ft 5% tube up there along with a ceramic heater and moonlight bulbs on a thermostat. There are also heat mats attached to the outside of the rear wall low down, again thermostatically controlled.
Humidity is controlled by a repti-fogger on a humidistat. I set it at 60% after referring to these care sheets:

How to Care for the Giant Waxy Monkey Tree Frog
Phyllomedusa bicolor care sheet - talk to the frog
MonkeyFrogs.com - Phyllomedusine Species List
Giant Bicolor Monkey Tree Frog Care - JABBERWOCK REPTILESJABBERWOCK REPTILES

I've turned the fogger off for tonight so I'll see how low the humidity goes. What do you think would be the correct level to aim for would be?
I'll get some photos of the actual animals in the morning.
Poop might be a problem - I haven't seen any yet!

Thanks again for taking the time to help!