I hava a south americn amazon tank (40 gallons) With 1 silver hatchetfish, 1 red-clawed crab, 1 Jack Dempsey Cichlid, 1 African Cichlid (I need to get that african fish our of my south american aquarium!) and 1 Bumblebee catfish. Right now its quite empty, but I'm going to get more fish soon...