The care sheets on Josh's site will have their recommendation for all the frogs they sale. When looking at a frog click on the "How to" link and it will link have several articles for you to read through. Most Dart frogs require 10 Gallons or more per frog. So the size of the enclosure is dependent on how many frogs you want to keep. I would suggest you read through the care sheets for the frogs you are interested in.