heh - let them get picked off or feed them to the re-housed girl in her own tank.
just because convict fry are not all that sell-able is no reason not to watch the best part of being a cichlid owner IMO. They can always be used as food for fish in other tanks, or in a large community tank they get picked off. I had convicts in a 125 for years and the bred all the time - the other fish ate most of them and the lucky ones got sold.