Welcome to the forum Josh. I have a 20 long in my photo album that I use for some baby Azureus. Its not really anything to write home about because its kind of a temporary tank for them until I get the time to finish up a couple of 18 cubes that I have in the works. Im not a big fan of the 20 long simply because its not really tall enough to do anything creative on the background. Although I would recommend it over a ten gallon. Most of your beginner darts are terrestrial and would use the extra length. You could use the ten gallon on a pair of small thumbnails, but I wouldn't recommend them as a first dart. Do some research on which kind of frogs you would like to get and we can go from there.