recently i bought 2 molly's (one is male, the other is female) but they seem to be quite aggressive towards eachother and also my male betta. The female chases the male around (which i know is weird because it's usually the male chasing the female) and the male chases the betta around. My male betta is very friendly and doesn't even chase back. I feel like he's getting stressed, what can i do to stop this?