they are brackish, but the kind of brackish that tolerates fresh very well compared to other brack/marines..
Be VERY VERY sure to change water when the medication period is over!! the meds can create a bacterial bloom thus killing the oxygene. A fish with a sore gill will have even more trouble handling that than it would under normal circumstances, take it from me, I lost 2000$ and unmeasurable sentimental worth of fish this way. change more than you think you will need, and then you change again..