To hatch apple snail eggs I let them harden up for a day or so where they were layed. I then remove them with something with a sharp edge like a spatula.
I make my hatcher from inexpensive stuff from the local craft store:

This is a styrofoam ring, and a circular piece of plastic used for hooking rugs. I then get a round glad container from the grovery store, or raid my wife's pantry.


Prop the eggs up on a few flat tooth picks to keep them from getting wet from condensation. Keep it out of direct light & float it in a tank away from bubbles. After a week or so at 80 degrees F they will look moldy, then hatch. You may need to help them babies once the hatch starts by rinsing them into the water, or gently crushing the case and dropping the babies into the water. This is easier than it sounds.
Feed the babies cooked greens like romain & dandelion. I boil for 5 minutes & drain. I also use sinking goldfish food.
Clorox after a hatch or two or it will get moldy & replace the toothpicks each time.