You will probably find that the critters on the rock consume the larvae before they hatch, once removed from parental care. At least that is what I found.
To truly rear the larvae, you must get the fish to lay in better conditions.
The Wilkerson book will tell you more. Don't worry, there will be many more batches of eggs.
P.S. If you DO get any fry, I am getting rotifers in.