[catfishmike]

i hate to aruge but it's really a case of all three fresh brackish and sea water.but like you said a real trooper in the way of fish.i think it just depends on the locality of the fish in question.from what i understand most are found in areas that are mainly fresh, but very close to estuaries and open seas,although they have been found very far inland and thriving.there have been many studies on which is better and the genral consensus was all three are fine ,but there were less problems in brackish and salt.but that just goes back to the whole salt makes lazy aquarium keepers argument.anyways just my two cents