Awesome, congrats, thought you'd have no problems with them. Well of course they don't always hatch, and they can hatch at different times. This also could be a second batch? the little ones in their look quite developed considering. I would generally try to remove the eggs as i find them, and put them in a little breeder tank, or even better side on tank, and put an air stone in with them to create a good oxy flow and good circulation without spinning the eggs around. However with BN's i've always left with the parents, as they are prolific breeders, and great parents and had no problems. When the egg sac has gone they will start grazing in search of foods just like their parents. Egg sack will be gone between 8-15 days. Do you have a guestimate of the size of the larger fry? Anyhoo, the presence of other predators would make the male not let out any fry from the cave, which isn't always a good thing. It is easier to feed them when they are kept in a smaller breeder... i just fed the veggies that the adults grazed on, tried to encourage algae growth. Could also try algae wafers and Sera vipachips etc etc
but congrats on the fry 
