Hi,
Congrats!!
The PJ Cardinals are born much much smaller than the Banggai. I believe it's potentially possible to raise the fry but you'd need to follow a regime closer to that of Clownfish rather than Banggai. I would suggest Rotifers and Copepod larvae. If you don't have these available then it's probably too late.
They should hatch in about 2 weeks. If you want to see them you'll have to move papa to a seperate tank or the fry will just turn into fish food.