Strictly SW fish. Just because a species occasionally visits BW/FW, does not mean it should be kept thus, in captivity.
Common Name: Stars and Stripes Puffer
Distribution: Red Sea , East Africa, S-Japan, Hawaii, Asia, Micronesia, Gulf of California to Panama, Galapagos Islands.
Water Parameters: Temp: 23-26C (74-80F); pH 7.9-8.4.
Personality/Temperament: Rather gentle. Sometimes described as cowardly.
Activity: Sociable
Max. Size: 19 inches (50 cm)
Estimated Lifespan: ~10 years
Sexual Dimorphism: Unknown
Diet: Likely live and frozen foods (not fish), freeze-dried krill, frozen shrimp, squid, clams and other molluscs and crustaceans. Feeding and Diet article
Care: Not reef-safe. Arothron hispidus can be kept in brackish conditions when young, but should be offered marine conditions as an adult. Will eventually need a huge tank due to its size, 300+ gallon tanks are highly recommended.
Breeding: Unknown