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Female Balloon Mollies nipping the biggest females on the rear


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Hi.  I have a tank full of only female balloon mollies and juveniles.  There are maybe 30 fish in all in a 29 gal planted tank.  Occasionally I'll introduce a male for a couple of weeks to help create some more fry.  There is a male in there now.  The reason for the post is from time to time like today for instance, I see the younger females nipping the rears of the big fat adult mothers.  I am pretty sure there is no real harm being done, but I thought I would just ask if anyone has seen this behavior before and maybe explain why it is occurring.  The big mamas get bounced around quite a bit and really do not retaliate.  It just looks odd.  Any thoughts?  

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