Respectfully, that is not correct. As @Colin_T said, female guppies have a pecking order. In the wild, there will be a group of 100 or more guppies, and 1 female guppies will be in-charge of it all. She will have a little āBody Guard Teamā That will be with her all the time, and help out with the āPeckingā.Guppies are neither aggressive nor terratorial.
This is a direct quote from a āGuppie expert sightā, āSo, it comes as a surprise to many, and especially to aquarists that have no previous experience with guppies, that these fish can become territorial and can become aggressive.ā
(If you would like to read the hole article, here is the link.: https://guppyexpert.com/guppies-aggressive-fish/)
Again, I mean no disrespect.