Take the gecko out and keep it out. Find a new enclosure and keep the two seperate. Mixing different species is a definate no, especially for novices. Invest in temp and humidy gauges, put them in the tank, take a reading, then come back and tell us what the humidity and temps in the tank are. Is this an American Green Tree frog (Hyla cinerea), or are you an Aussie speaking of a Whites (Litoria caerulea)? I'll give you a link to go to either way, go, check it out and compare it to your current set up. Fix whatever may be wrong, then if the frog doesnt come around come back. BUT remember that some frogs stay brown most of the time and live normal lives. But you must remove the Gecko.
Becki's Page
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*~~Whitney~~*
There are two types of people in this world, good and bad. The good sleep better, but the bad seem to enjoy the waking hours much more.