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Join the conversation: Cardinal Tetra
Pet Information: Cardinal Tetra

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"I have had 5 Cardinal Tetras in my tank for a year now.Lately,one of them has been acting strangely.It started by keeping itself away from the other fish and seemed to prefer a quiet corner.Now it seems to have a problem when it stops swimming because its tail goes up and it ends up being vertical.It still feeds with the others,but not so eagerly.I have just spotted a brown patch on top of its tail fin.Has anyone any ideas about this?"

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