How big do aquarium frogs grow?
It depends. African dwarf frogs max out at an inch or two. Cane toads get as big as bulldogs. I’m guessing (but I could be wrong) that what you have is an African Clawed Frog, which will indeed eat all the fish in the tank, and will grow to about a foot in length. So unless your tank is quite large, you probably need either to get a bigger tank or to find a new home for your frog.
