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Old 01-22-2014, 12:33 AM   #1
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Black Cardinal fish aggression

Hello everyone I purchased 3 black cardinal fish about 4 days ago. All seemed fine until tonight, I was watching them when one of them went after the other and grabbed it on its mouth they were like that for a few seconds before it released the other one. I have never seen cardinal fish do this. Can anyone shed some light on what is going on? I thought cardinals were peaceful.

I tried looking them up but I can't find much about them. Thanks in advance.
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Old 01-23-2014, 12:29 PM   #2
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sounds like you got two males and one female or just three males , and there fighting for dominance of the tank , females are the most docile if your looking to school them,
two females to one male is the optimal match up and will curve aggression
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Old 01-23-2014, 01:19 PM   #3
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Thanks for the response. Is there an easy way to sex them? I have no clue how to tell the sex of these fish.
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