you'd preferably want fish the same size as the frogs, DEFFINATLY NOT IN SALTY WATER, it will kill them, and generaly the wast of the fogs doesnt harm them, but you would wont like 20 frogs with 20 fish, or you'd have to clean the tank out every few days, as for the frogs ive done a bit of research on them and have never heard of pinky frogs, wer did they come from? what is ther scientific name?