Chances are they're already being released and eating while you're not around, in many cases this is par for the course and this is why you may want to feed and walk away. It can take time for some parents to release fry with you present, sometimes not until they're ready to move on from a current batch and start thinking about the next one. It's easy to wonder about this behavior, you can think you have a fish that's tame to you, you may even be able to hand feed or touch it, but all this can change when it's rasing fry-- even a wet pet fish can get very defensive.
Besides feeding small or crushed up foods, I like to keep driftwood with algae/biofilm on it in fry or maternity tanks, besides algae there tends to be other microflora/microfauna in there, and fry of most any species I've bred, including geos, will graze on this-- which means I have to do less feedings to raise fry.
