just got a gsp and i was told they where freshwater puffers but went to brackish when they were older. is this true? hes about an inch and i got him in a 10gal freshwater setup i was going to put him in a 30gal breeder with a pair of firemounths. i guess i can set up the 10 to brackish but i need some info on that cause i never set up a brackish tank before