Cardinal Tetra got bitten

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Cardinals are a sensitive fish to keep so yes it more likely happened post mortem. I would not stress out yet why it died it could be anything. Fish will do this so will shrimps as well eating dead things is normal life occurrence to them. If it was left in tank for another day or two you might have never saw the corpse. Sorry for your loss.
Thanks.
 
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My money is on Congos or Cannibalism. Congos are ruthless, though mostly to their own kind. I had at least 20 at different times and they killed each other all the way down to one. Since all are community fish (besides the semi-aggressive Congos), I would also lean towards cannibalization. It's just as likely if not more that a fellow schoolmate ate part of the dead body.
 
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My money is on Congos or Cannibalism. Congos are ruthless, though mostly to their own kind. I had at least 20 at different times and they killed each other all the way down to one. Since all are community fish (besides the semi-aggressive Congos), I would also lean towards cannibalization. It's just as likely if not more that a fellow schoolmate ate part of the dead body.
Yeah.
I have the same suspicion on the Congos. They seems to be chasing all the Cardinals, guppies and danios. Another suspect, is my SAE who are doing the same as the Congos when the fishes get too close to them
 
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Yeah.
I have the same suspicion on the Congos. They seems to be chasing all the Cardinals, guppies and danios. Another suspect, is my SAE who are doing the same as the Congos when the fishes get too close to them
The Congos have even broken my bichirs finlets. Because Bichirs won't fight back, the Congos bit the top finlets, and they also had fun chasing one another. They were ruthless. One dominant male pictured below was the lone survivor. They make their own social class. Most aggressive fish up top, and the most peaceful fish below. When trying to climb the ladder to the top, they will get bullied and ganged up on. Happens during the night. They will tear the fins off, and leave it to my Delhezi Bichir to hide the evidence in his stomach!
 
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The Congos have even broken my bichirs finlets. Because Bichirs won't fight back, the Congos bit the top finlets, and they also had fun chasing one another. They were ruthless. One dominant male pictured below was the lone survivor. They make their own social class. Most aggressive fish up top, and the most peaceful fish below. When trying to climb the ladder to the top, they will get bullied and ganged up on. Happens during the night. They will tear the fins off, and leave it to my Delhezi Bichir to hide the evidence in his stomach!

Now I know why my guppies and danios are all hiding in groups with their tails riped in some areas.
 
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