Tetraodon nigrividis is not a dwarf puffer. It is a green spotted puffer that grows to about 6 inches as adult and requires marine condition.
The real pure 100 percent FW is the Carinotetraodon travancoricus.
It does not live in brackish condition at all. It is a dwarf species from India (I think).
My info came from the thepufferforum.com and dwarfpuffer.com
Js
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