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I'm posting on behalf of my brother. Overnight, four of his fish died out of the blue. He said the water levels were normal and they weren't over fed. Any clue what happened?
what are the exact water levals?
what test kit?
what size tank?
what fish died?
any symptoms?
what are the other inhabitants?
any changes to the tank? IE water changes, new fish, change in chemicals, new ferts, etc