congrats, man. that's so awesome. I remember how excited I was when my old shoal bred and I found fry during water change.
probably would be a good idea to remove the gravels from the tank if it's not too much trouble. that way it can help keep the tank as clean as possible cuz I'm sure they won't eat all the brine shrimp and some of them will start decompose under the gravels if you can't get them out.
best of luck growing out the fry, they grow very very fast.