They are a strictly FW fish.
Look for ID & care: http://www.**************.com/forum/ug.php/v/PufferPedia/Freshwater/
My guess is's one of the Carinotetraodon species?
Ok hes either a red tailed puffer or red eye puffer, don't wanna turn on the light yet to check. Next time I do a water change (sunday) I'll put no salt in. Will he be ok for a week?
Yes only 1 because just in the 5 min. I watched them I saw one attack another one. Yes its one teaspoon per gl. in there. So far he looks fine and I will give him bloodworms tonight.