I don't use any substrate at the bottom, and wouldn't unless I was setting up a full vivarium. Frogs are notorious for getting stuff stuck in their mouth, especially these ravenous little guys. Not to mention, stuck all over their skin - not much fun to have a pet constantly covered in crud.
I use a 10 gallon tall, I keep a white's and a big-eyed tree frog in it. Large water dish at the bottom, several branches with fake leaves on them. Both frogs are pretty active, croaking every night. [img]modules/Forum/images/smiles/icon_smile.gif[/img]

You can see both frogs in the pic, and my beardie in the cage behind wondering why I'm taking silly pictures instead of feeding him. [img]modules/Forum/images/smiles/icon_smile.gif[/img]
Rav
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There is a fine line between a hobby and a mental illness.