Its a brown puffer Monotrete Turgidus
Semi lurker, enjoys lots of plants in tank min 20g. I would suggest about a 25-29g
Information from The Puffer Forum: (I do not claim this as my own knowledge)
Date: 15/08/06
Owner: PufferPedia Admin
Size: 18 items
Common Name: Brown Puffer
Distribution: Mekong Basin, Thailand, Laos
Water Parameters: Temp: 23 - 26C (74 - 80F); pH:6.0 - 7.8
Personality/Temperament: Aggressive.
Activity: Hunter. Nocturnal and twilight activity mostly.
Max. Size: 6 inches (15 cm)
Estimated Lifespan: Not known
Sexual Dimorphism: None Shown
Breeding: Awaiting Information
Minimum Tank Size: 20 US gallons (75 liters)