If you can't id your puffer then i can not tell you definitavley. It infuriates me that people keep Green spotted puffers in freshwater. make sure you do not keep that species in freshwater. The that you even had to ask this question means you are not ready for puffers. You should do a bit more research first. Ill give you some good links. Also, the most important thing to know is puffers are extremely extremely aggressive. Their jaws are designed to crack open shells, imagine what that does to soft flesh. Also fish can detect vibrations in the water through thier lateral line. Since puffers don't use their tail they do not produce much vibrations and thus they can sneek up on thier victums. Thank god they aren't nocturnal!
To Identify your puffer go here:
[URL="http/www.fishbase.org/identification/spe...8&areacode="]http/www.fishbase.org/identification/spe...8&areacode=[/URL]
Then go to the oddbal fourum and look at the "pinned" topic
Puffer Central