Guppy aggression

GuppyGerardO

So after giving birth to around 18 fry my postpartum guppy seems very aggressive to the point that she nipped the fin of my other guppy. I already separated her for 2 days just to calm her down but when I tramsfered her back to her community tank she still kept on chasing and bullying
 

TheWildType

If she wasn't exhibiting this behavior before, and there are multiple fish in the community tank for the aggression to be directed towards, I would just leave her in there and monitor for any serious injuries. It is most likely due to stress from being moved around and having to reestablish her position in the community tank. Although guppies are relatively peaceful, if you watch a group of them you will notice some are more dominant than others and she may just be reestablishing that dominance.
 
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