I am confused then. There may have been an electric short through the water for a brief second? It's rare but possible. I still would blame the pacu though and you said he is one that is still alive and you're trying to save.garhog;3886617; said:the only thing I can think of is one or more of my cats puked up the shrimp I fed them and spoiled the water though they have never done this before I believe it is possible. the heaters and pumps were all running temp was normal did a 50 percent water change the night before. the water when I got home was poor quality but wasn't sure if it was from the dead fish floating in it. but I think it makes more sense that the fish ruined the water and the elevated ammonia killed them but I not sure I have never lost a fish due to water quality and never had multiple fatalities all at once now I have to think of how to prevent a future occurance. I think 800 gal would have bought me some time. but who knows
No scars on the fish right? No random deathmatch of doom?
You'll definitely have to let me know what happened so I can avoid it. It kind of seems like a rendition of "Burn After Reading" starring George Clooney at the moment.