hey, how is your frog doing?

I work with them in the lab.. have about 102.
The best way to keep tree frogs healthy is by not making their habitat too complicated, i see that yours looks very nice, but they don't tend to do well in this sort of set up.

The best set up for them is -
have a peace lilly in a plant pot (medium size for the tank) in a bare tank with layered blue-roll as the ground surface, keep it very damp and have a large water bowl. They hardly ever get sick this way, as long as its cleaned out everyother day (which requires taking out the dirty blue roll and cleaning the tanksurfaces with blue-roll and water to get rid of poo/sloughing/wee (no cleaning products).
I know this isn't the best looking tank, but your frogs will be much happier, they need quite a sterile environment.

hope this has helped.

http://www.hygienedepot.co.uk/p1362-...ll-Towels.aspx
heres the blue-roll

Sophie