the tsn will 99% eat the oscar. my old tsns would eat bluegill sunfish for some added verioty to the diet. so the body shape of the oscar doesn't mean that it wont be eatten. 90% of tsns, rtc, planiceps, piraiba, ect don't have tankmates just future snacks. i had some large bala sharks with my tsns before i thought they were too fast to be eatten. heres a pic of how that ended.
