i recently got a young pike cichlid. not sure what type but its one of the larger green species. Anyways mine does fine and is the baby of the tank at 3 inch and is in with a jag, Oscar, and lima shovelnose. my oscar (average oscar, always hungry and not too aggressive) is getting big too at around 7 or 8 inch and doesn't bother him. who knows tho you could have an aggressive oscar. my pike even bullies my shovelnose who is bigger than him. my opinion on pikes is that they can hold there own even against bigger fish, you never know till you try I guess. set up your tank with enough territories for them to hide should help too. pike cichlids are interesting fish, I would recommend them to any cichlid lover. good luck!