I think a nice planted nano tank would be awesome for a pea puffer. It would be a great learning experience on planted tanks and like the picture can come out really well. And you'll never have snail problems!
Just had to add this second picture. Love when people make tree's in their tanks.
Again I would still advise looking at some of the rimless nano euro tanks. They are very nice and attractive a perfect tank for your kitchen. As I've heard many problems with the Fluval edge (Algae problems, Melting of light fixture and problems with the light over all.). I understand the ease of an all in one tank, but with a normal tank you can do so much more without having to rip off and retro fit low quality stock parts once something goes wrong. Unfortunately this is a problem with almost every single All In One tanks. Bio-cubes are a great example, someone with experience will not buy one unless super cheap, or they have a plan for it. Newer people will always buy them then once gain more experience usually regret it or change out all the part for better ones the thing should have came with in the first place!