See if the parents will guard/raise them until they are into the planktonic stage. On the day of the hatch, 2 hours after lights out, you can shine a flashlight into the tank and collect the babies with a clean white bowl.
If she won't raise them you can try laying a tile over their egg laying spot, ensuring the tile is as vertical as the surface the eggs were originally laid on. Then remove the tile after you are sure fertilization is complete.
Good luck.
Read more in the J. Wilkerson book.
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