I've seen from many different sources many different opinions on what size a terrarium I should get my tree frogs. I plan to get three and I've heard anywhere from a $20 10 gallon tank to a $140 30" tall tank. Also I've heard people mention that buying a haxagonal (BTW do you pronounce it hex-A-gon-al or hex-a-GON-al, personally) is better than buying a normal one and putting it on its side. I want to make my frogs happy, but also not have to spend an arm and a leg on it. Also, ecologically is it okay to buy three or would the majority sex dominate the minority. Thanks in advance.