Just make sure your setup has the correct requirements well ahead of time.. GTP's are pretty picky about their husbandry...

I am personally looking to get an amazon tree boa at the reptile show this weekend. They have close to the same requirements, but are a bit more forgiving. Im going to get some experience with those first before I move onto chondros or ETB's.

I have a ten gallon setup (getting a neonate) I have it on end with half of the screen covered. I have a moss/ecoearth substrate and a big waterdish with an air pump running in to it so it bubbles at one end (provides extra humidity and little extra air circulation). If I keep my substrate moist, my humidity holds at just a little above 70.

Just some ideas if you are going to go the aquarium route...

good luck!