[Desert Pupfish]

I had 6 dime sized angels in a 55 gal tank to try to get mated pair They did fine at first, but one grew way faster than the others and became a terrible bully. The tank was planted, but not especially dense, and he chased some relentlessly. One jumped out, and he killed another. Once he'd eliminated one, he'd start in on the low man on the totem pole. This confirms what I'd read & been told: they're usually pretty peaceful, but they are cichlids and can get aggressive. So like others have said--keep a close eye and be prepared to immediately remove the bully, or his victims. Your mileage may vary...