4 inches is kind of small. Inviting trouble at those sizes
Well the demasoni were in the tank when my polys were only 6 inches but as time passed they hunted them all down. And I actually have 1 inch red jewel fry in the same tank and they haven’t fed on any of them. But my polys are my trophies so it’s a sad fact of life I’m willing to accept without much remorse as the cichlids were only added as to add life to the tank because my polys were awful boring when they were tiny.