So last night I did my first 10% water change on my newly cycled tank, it is a 55 gallon with 55lbs of live rock and 50lbs live sand. fish have been in for a week and I decided to do my first water change. I had three fish in the tank, two clowns and a yellow tail damsel. fish have been eating twice daily with great appetite from day one in the tank, I mixed my salt water and matched the salinity to that of the tank. I tested my water before and after the water change and the parameters were near perfect. after the water change I noticed the damsel and the one of the clowns acting strange, the damsel died with in two hours and I woke up to a dead clown this morning so naturally I tested the water again and it was still perfect. any advise or insight to what has gone wrong would be greatly appreciated. I also took some rock out going from 65lbs to 55lbs could it be stress related?
PSA - I have had saltwater tanks all my life as well as freshwater tanks and ponds this is the first time I've ever had fish die because of a water change.
PH - 7.8
Hardness - 500
Amonia - 0
Nitrates - 20
Nitrites 1
CHlorine - 0
Alkalinity - 80
PSA - I have had saltwater tanks all my life as well as freshwater tanks and ponds this is the first time I've ever had fish die because of a water change.
PH - 7.8
Hardness - 500
Amonia - 0
Nitrates - 20
Nitrites 1
CHlorine - 0
Alkalinity - 80