I THINK you need at least a 20 gallon for a single white's tree frog by the time it is full grown.
Some White's Tree frogs might find a 20 gallon to be dis-satisfactory however and might try to escape, especially if the aquarium is not tall enough. (Tree frogs like to climb) My frog used to try to force the lid of his twenty gallon open until I upgraded to a 33 gallon. Since then he has been fine. It depends how active your frog is though. If you see it trying to get through the lid I recommend upgrading, or at least making sure the lid is secure. I've heard tales of frogs actually getting through the lid and then you have a problem.
Edit: I forgot to ask, do you have any pictures of it yet? I'm curious to see if your "Blue dumpy" is a "blue phase White's Tree Frog" or if it is just false advertising.





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it would be a good idea to upgrade his terrarium. I would do so as soon as you can, but before he reaches 3". I would go at least 20 gallons, and the taller the better. I'm not sure if you have ever seen them, but I really like the exo terras. They may seem really expensive, but they come with everything you need if you buy the kits. I have a 18x18x24 (which is around 30 gallons) exo terra for my two whites tree frogs.
