Ask yourself: What do you plan on doing with the fry? Long term.
Convicts are ridiculously easy to breed and their offspring are hard to find a home for. You may consider leaving them in your display tank and watch nature play itself out. Watching the parents evolve through fry care, then set them free as they move on to create another brood, then watching the older fry become predators to their younger siblings, makes life in the display tank that much more interesting.
I would expect your Jewel fry to eat the younger Convict fry. Often, even if they can't "fit them in their mouth", they will eat the soft flesh. Then once the soft flesh is gone they can more easily fit what is left in their mouth. Or just go for the soft flesh of another one.
Cichlid fry are often far more aggressive than their adult parents, just on a physically smaller level.