Ok so I have a green spotted puffer, otherwise known as Tetraodon nigroviridis.
I am finding a good deal of conflicting material as to whether or not this fish is indeed brackish.
This source, says its not.
and this site, can't seem to make up its mind
Spotted Green Puffer - Tetraodon nigroviridis
In the environment it says " Best kept in brackish water." but then in the Aquarium setup, it says "Often sold as brackish water species however this species should only be kept in freshwater."
Can someone point me to a definitive source on how to correctly identify this fish as either a nigroviridis (green spotted puffer) or a fluviatilis (green puffer), and if it is truly a brackish or freshwater species.