I recenteley bought 4 black skirt tetras (planning to get more) and there seems to be a bully in the group. They are in a 75g community, and the bully isn't bothering any other type of fish just his fellow species. I know that my female bettas fought amongst themselves for a couple weeks when I got them but then "worked it out" and are not fighting anymore. If anybody has any advice sharing it would be very appreciated. Thanks!