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Rainbowfish aggression


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So today I was watching my gertudae rainbowfish, and two males started flashing at eachother. When I looked at one of them, his fins looked like they were nipped, and surely enough, the more dominant one started nipping at the previously nipped one. Other than more line of sight breaks (I have some plants reverse resperating), is there anything I can do to reduce aggression? I currently don’t have anything to separate them, but I might swing by petco after my shift to get a breeder box if need be.

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