so today my 4 month old fish only tank had a massive failure after a water change =( i lost my black clown fish, coral beauty and my 3 stripe damsel for the life of me i cant find what went wrong when i measured the tanks levels i fount this PH: 8.2
NO2 Nitrite: 0
NO3 Nitrate: 0
NH3/NH4 Ammonia: 0
GH General Hardness: 180
KH Carbonate Hardness: 240
Salinity: 1.021
i was quite devastated at the loss of my beautiful fish steve at pollys said it must be my waters KH and GH can anyone offer any insight to my situation