Thank you so much for the advice! Though my tank is already pretty planted as is, I've already given her a couple sections and I'm afraid adding any more plants would just squish all the fish even closer. As for the guppy size thing, she's been with every size guppy since she was small and these current guppies are like my... 9th generation(? honestly I've lost track after these few years) and they've never done anything like this. It seems like every size is pecking at her too, from practically newborn to my oldest. Males and females equally too. : ( I'm probably just gonna try rehoming all the guppies I can catch.