FBTs definetely croak if you get more than 2 of them, and you have to because they like their own company around. They croak every night for about 3 whole minutes every half hour or so. Its about as loud as a normal conversation, although if you're trying to go to sleep, it sounds pretty loud. And I think they would be able to eat the fish or shrimp in the tank.does anyone know if FBT or floating frogs croak? and if so how frequently/ loudly is it? also would any of these or a FBN eat shrimp or very small fish such as pygmy corys?