They eat hikari cichlid gold and raw shrimp. Only a couple of fry left today, although they're quite hard to spot so there could be more hiding somewhere.
Seth they're not being too aggressive, they were keeping the loaches and metynnis down the other end of the tank but dropped their guard while I was doing a water change this morning. Yes its way sooner than I expected, will let them have a few more practice runs before i bother putting any effort into saving the fry, I haven't got anywhere to put them for now anyway.