Hello. As a lot of you know, I have a 55-gallon set-up with eleven danios, nine corydoras, one albino rainbow shark, one albino bristlenose pleco, and a bunch of snails. Every once in a while, I’ll catch a certain group of danios chase a single danio until it ends up wedged between a rock, breathing heavily. It seems rather stressful for the poor thing that get chased. This usually happens early in the morning and happens to random danios by random danios. I heard somewhere that these guys mate for life and I’ve never actually seen any eggs, so I doubt that it’s breeding behavior. Just making sure. If a danio gets close enough, it’ll kind of twist it’s body around the victim and then they’d dash away from each other. Nobody gets hurt, though. Thanks to anyone that responds.