I dont know if that would be such a good idea. I know that male bullfrogs are very territorial, in the wild they each have a territory of about 4 or more feet of shoreline, and they actually wrestle to defend it. If you had n adult male and female in there, i dont think the tank would be big enough. a female bullfrog IMO needs a larger tank when fully grown, as they can be enormous frogs. I have my adult male bullfrog in a 55 gallon now, but by this fall he'll be in a 75 gal. he stopped growing during the winter hibernation, but is eating now and thus growing more.