This is the dwarf puffer (http://www.seriouslyfish.com/species...travancoricus/), they are really tiny when you find them at LFS, like tetra size or smaller. Those with glowing like head you see in LFS are the normal size ones which can grow quite large and as mentioned need brackish as they grow older. It was one of the first few fishes I got when I started out thinking they were small and how great it was to keep puffer in freshwater...
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