It may work in a big tank (55+) with lots of plants, hiding spots, etc. When they meet, they will fight, until one of them gets away or submits and then gets away. Since we all know everything we read on the intarweb is true, I'll also mention that I read somewhere that the aggessiveness is sorta being darwin'd out of them thru selective breeding for the fancy finnage. Can't tell by mine - they get along fine wiht teh corys and platies I have, but their reflections or even a pic of another fish with long flowing fins sets them off.