Yes, that would be great for them. I have the 24x18x24 with a group of 5 and they are all happy.. so a pair in your tank would be great. By adding background 'ledges' you are increasing the space inside the tank.. so the more areas you give them off of the ground really adds to their space well.

If you haven't had a front opening tank before.. I think you will really enjoy it. So much easier to mist and feed.. as well as trim back plants. Just make sure you keep an eye on your little guy/gal so they don't dart out when you aren't paying attention. I've never had them attempt to do it.. but I've heard stories about other frogs trying. Mostly thumbnails.. but still have to be cautious