Acrylic... pond... and simple don't really fit together well at all. Acrylic is hard to clean and absorbs water, even from the atmosphere. You'll see it happen when you have higher humidity on one side that the other - the high humidity side expands so the acrylic bows. Try using it unframed as a lid for an aquarium...
I'm really curious about the often stated idea that GTPs will do well in enclosures with ponds, large bodies of free-standing water, COUPLED with inbuilt sprinkler systems. They live in trees with lots of air circulating around them, not in wet swamps with limited ventilation. They get wet when it rains, they dry off as soon as it stops. At most adult GTPs need to be sprayed once or twice a week, with the exception (maybe) of when they are shedding, and only then for a day or two before they do shed.
And then there's cleaning the acrylic... scratches easily (from the first time you wipe it down), and it is highly electrostatic so it attracts dust.
I totally understand the desire to place them in an aesthetically pleasing, maybe planted enclosure, but incorporating more than a bowl for drinking water, which can be quickly and easily removed to allow cleaning, is asking for trouble. If you don't remove and scrub a water bowl for a week or two, you'll feel a layer of slime on the inside when you run your fingers over it. That's a bacterial film which may end up contaminating the fresh water you place into it if it's not removed. A built-in pond will be almost impossible to effectively clean.
Good husbandry should be the No 1 consideration, and large bodies of water which your snake can defecate into and are hard to remove or clean should not be part of any good enclosure.
As I said, these are tree snakes, not swamp snakes.
Jamie
