Hi,

As mpmistr wrote, the system is overpriced. Also, it is too small for the frogs to thrive. How is this "magic gravel" supposed to work?! The only possibility I can imagine is something like zeolithe which absorbs organic components, but this doesn´t work forever. After a certain amount of time, the absorbing capacities will be exceeded and you´d need to replace the gravel. As it is hardly predictable when this will happen, systems like this put the animals in danger. I´ve read quite a lot forum entries about similar system and it always ended up with sick, dying or dead animals.
I would go with the 10 gal. A filtered, heated and cycled aquarium with regular maintainance such as weekly partial water changes is the much better choice here (plus it´s cheaper). ADFs are widely sold, maybe you can even find a local breeder.