Thank you!!Welcome to the forum!
Maybe your male was already sick and died off a disease. The females are generally not aggressive to males, if they aren't guarding fry. If that's the case, she could have probably killed him.
Aggression also depends on the size and length of the tank.
Cheers,
Billy
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Mine were in a 60. I might have had a few Bolivian rams in there as wellAlso i believe Borelli are Pairing fish not harem, correct me if im wrong! You mind me asking what size tank you had them in?