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Hi i introduced some cardinal tetras into my tank and theres 2 of them that seem to be defending their little 'area' so as other cardinals swim towards or into that area they chase them out, then return to their little place.

what is happening?
 

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My guess would be that the 2 have spawning on their mind. Mine never act territorial like that anyway.
 

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Definitely a mating related issue. I don't think Cardinals will gaurd their eggs, so it might be two alpha males trying to show the other who's boss..or they might be displaying to the females.
 
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