At some point, the eggs need a certain level of salt in the water, in order to hatch. I'm not sure of the specifics/degree needed. Maybe someone else around here has dialed it down. Without salt, I believe the egg deposits will just collect like little gum drops around the tank!
I'm working on this currently. When I looked into it I found that it wants Brackish water with high pH and hardness. I've added crushed coral for substrate in that tank. After the eggs are laid, the article suggested increasing the salt content closer to full salt water.
I'm only two weeks into the process of going brackish so nothing yet.