When I was keeping bichirs a while back, I had the same thing happen with my senegals and some others.Unfortunately randomly lost a platinum senegal (not the original one). Suspect sudden death. Very baffling. Super clean, no visible external wounds or infections. RIP
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I started to think it was a case of inbreeding affecting longevity in these captive bred fish. Especially, the more designer strains.
Crappy feeling when you lose a fish you know you could have had for a long time.