Need some advice please. I have a 140 gallon tank with a 14 inch oscar, 15 inch pleco, 3 adult severums, a 12 inch eyeless bichir, a 13 inch ornate bichir, and a 15 inch ornate bichir. I do 50% water changes every Monday. I have an emporer double wheel hob and a fluval G6. I feed every other day a variety of Hikari pellets, algae discs, and frozen krill. Today I found my 15 inch bichir dead. No obvious wounds of any kind. He has been doing great, and is only about 3 years old. I tested my water and the PH is 7.6 and the nitrates are really high but I have been battling that for a very long time. Does anyone have any ideas? If he swallowed a rock, would he not get bloat and show symptoms? I am taking him to a Veterinarian tomorrow for a necropsy but it is just killing me. Any advice would be appreciated.
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