My tank is over 2 years old. it is It is a custom 230 gallon glasscages aquarium. My tank used to be stocked with a Fox Face, Sailfin Tang, Blonde Naso Tang. 2 clowns, 2 Vlamingi Tangs, Algae Blenny, Coral Beauty, Purple Tang, and Green Mandarin, and Pistol Shrimp. In early December 2021, I woke up to a tank full of dead fish. No signs of itch or velvet. No marks on any of them from fighting either. My Algae Blenny and Shrimp were the only ones to survive and still thrives in the tank. I didn't add anything new to the tank until 2 weeks ago. I purchased quarantined Green Mandarin, Longnose Hawkfish, Fox Face, and 2 Blue Tuxedo Urchins. The next day the Fox Face was dead. The second day the Mandarin was dead and later that night the hawkfish. Five days later one of my urchins was dead. My blenney and shrimp are still going and so is one of the urchins.
All my water testing has looked stable but to be safe I sent in for an ICP test. Got the results this morning and nothing major sticks out. Calcium is slightly low and Magnesium is slightly high. I do daily automatic water changes and I monitor everything on my apex and trident.
I attached my ICP results. I keep salinity at 1.025, PH 8.2, Po4 .05 to .08, Nitrates 12 to 16, Alkalinity around 9.
I am at a loss on why I can't seem to keep fish alive. Is there anything else I need to check?
All my water testing has looked stable but to be safe I sent in for an ICP test. Got the results this morning and nothing major sticks out. Calcium is slightly low and Magnesium is slightly high. I do daily automatic water changes and I monitor everything on my apex and trident.
I attached my ICP results. I keep salinity at 1.025, PH 8.2, Po4 .05 to .08, Nitrates 12 to 16, Alkalinity around 9.
I am at a loss on why I can't seem to keep fish alive. Is there anything else I need to check?