okayyyy,,,here we go,,, i am on well water,,it has been tested,,,A+ I also have a 55 gal plastic barrel with my water premixed,as it seems to be the way to go,, i have only 3 fish 2 clowns and a goby,,,2 shrimp,,,10 hermits,,, 2 conchs,,,3 naccius[sp} 5 nerites 3 emerald crabs,,, i change...