I tend to leave mine to fend for themselves which at the moment they are. I've only intervened once and that was when my daughter saw them and wanted me to "help".
Mine are doing well (about 3 weeks old now) and my other inhabitants don't seem to take any notice of them. The fry even come up to the top of the tank for feeding with the others and it's all good.
I know others haven't had this experience with fry getting eaten but that's the way we roll in my tank