they all have teeth. cichlids have teeth on their lips so they can "kiss" and fight off other fish. thats why many cichlids have worn down lips after disputes with eachother.
I'd have to say piranhas have the largest meanest teeth. but oscars have size. and the african cichlid wasnt specified, heck it could be a kribensi. they are african cichlids too.
obviously the betta and tiger barbs wouldnt have much of a chance.
black piranhas, or "rhoms" are much bigger than red piranhas. I'd put my bet on the piranha. (not that I would ever support an actual fight between the fish). yup, they'd own them all. especially in groups where their feeding habits are magnified. solo piranhas can even be kinda docile. but in groups they can be pretty mean.
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