I actually had one like that a few years ago, it was called a green spot puffer but it looks about the same. Mine was in my salt water tank with a dwarf lion and an eel. I've seen them at ***** in the freshwater section but I was told you can slowly acclimated them to full salt water if you slowly add a little salt at a time. Not sure how long it takes tho, but they are cool, small fish.