Yeah i don't even know about a 15-20 gallon tank, maybe just for babies, but for juvi's you're going to need at least a 50. And it won't be long before you need something MUCH larger. Chinese Water Dragons are Aboreal and prefer height over width. So glass aquariums aren't always the best solution unless you stack them or something. Also if you do go with glass you have to be careful of your dragon rubbing it's nose against the glass. This is a common problem, expecially in WC water dragons. Many people build their own enclosures using a variety of materials, mainly wood with glass doors. The wood is coated with a polyurathane and seaked with aquarium silicon. This does 2 things, it keeps the wood from rotting, and it also helps keep the humidity up. Also in most cases, building your own enclosure gives you much more space for a much cheaper price. For instance mine is 6 x 4 x 2 which is approx. 350 gallons, and it cost me about 120 to build including 2 glass hinged doors. Water Dragons get big, which is why the require such large enclosures, if i could I would have made mine deeper and wider. Males can get up to 36-40" in length over time.
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