I have never hatched snail eggs, but if you don't want to deal with them, you can take them out. They will dry out and not hatch. If you do want to hatch them, here is some info I was able to find at applesnail.net...
Species that lay eggs above the waterline (genera: Pomacea, Asolene (Pomella) and Pila): After the eggs are deposited, they are soft and have a rather milky, pink colour. After a few hours, they harden and get their definitive colour (from pale pink to raspberry-red or even greenish depending of the species). It might happen that the eggs at the surface dry out, on which they get a lighter colour.
The size of the eggs varies from 2.2 to 3.5 mm / 0.01 to 0.14 inch each (in case of Pomacea canaliculata), whereas Pomacea paludosa and Pila globosa for example lay eggs with a diameter of 4 to 7 mm / 0.16 to 0.28 inch. The eggs at the surface probably won't deliver you many little snails when the air humidity is not optimal, but often the eggs deeper inside the clutch thrive well.
It's no problem to transfer the egg clutch to another location, as long as you are careful not cause too much damage. A damages clutch is more prone to infections and evaporation. The best way to move the eggs is by wetting the clutch, wait a few hours and then carefully move the clutch over the surface until it comes off. Obvious this method of most succesful on glass or other smooth surfaces.
It's important to keep the eggs in a moist, but not wet environment. Never keep these eggs under water (this will drown the embryos)! Keep the temperature between 18 and 28�C (65-82�F). The higher the temperature, the faster the snails will hatch.
Note!: Not all apple snails from the genus Pomacea lay their eggs above the waterline in a clutch. Pomacea urceus lays about 50 to 200 orange eggs at the inside of the shell near the aperture. The eggs are brooded in this incubation chamber closed of with the mother's operculum (shell-door), while the snail aestivates in the dry mud during the dry season. The young snails hatch during this period and crawl around under the female's shell until the rainy season starts. A side effect of this reproduction method is the scar is left on the mother's shell at the place where the eggs were attached.
After 2-4 weeks (depending on the species and the temperature, 14 days at 25�C in the case of Pomacea canaliculata) the first little snails should appear. If they don't after 3 weeks, you can try to help the young snails. It might seem rude, but it works: just break the clutch in 2 - 3 parts and those in the water. You can even wash the snail out of the clutch by moving the broken clutch parts trough the water. Note that this isn't necessairly when the moisture of the air is sufficient.
If you don't see little snails after breaking a 4 weeks old clutch, it can be that the eggs aren't fertilised or that the air moisture was too low. In the latter case the yolk is very thick or the eggs are completely dried out and filled with air. You might want to wait until the snails appear on the natural way (it can take several days before they all are hatched), but keep in mind that if the clutch isn't kept moist enough, the young snails won't be able to make their way out and subsequently die.
Many young snails might die within the first weeks of their existence, but those who survive grow quickly. At a size of 2.5 cm /1 inch (2-5 months) in case of Pomacea canaliculata and Pomacea bridgesii, they are able to reproduce and the next generation will appear if you don't remove their eggs in time.
From the day they hatch, the young snails eat the same as their parents, so there is no need for special babysnail-food. Keep in mind, however, that it's often difficult for a young snail to obtain enough food in a completely clean tank. The long distances they need to walk in such case to reach the food could simply be too much. As a result of this, it's often easier to raise little apple snails in a tank with algae on the walls so the little snails have enough food (algae) withou travelling all around.
The young apple snails can stay in the same aquarium together with their parents without being eaten by them as long as there is enough food available. However, larger fish with preference for (little) snails can be a reason to keep the young ones in a separated aquarium until they have grown somewhat bigger.
If one plans to transfer the little snail to a separate tank, be sure that their new environment is already a somewhat stable eco-system. In other words: put 1/3 water from a pond or another aquarium with 2/3 fresh water and let the new tank stand for 2-3 weeks with vegetation, without other inhabitants before adding little snails. Such approach certainly increases the success rate with raising young snails.
And last, but not least: algea and debris might not be appealing to the human eye, it's certainly appreciated by the little snails.
