Parameters before I left (I still need to take new parameters, so busy since I came back):
Salinity: 1.027
PH: 8
Alkalinity: 7
Calcium: 480
Phospate: 0.5
Ammonia, Nitrite, Nitrate: 0
The tank is a 100 Gallon tank with a 20 Gallon sump
The 4 fish that died where 1 big one (yellow tang) and 3...