1st off you need to think hard where you going to put your 200+ apple snails, it might not seem like it but trust me their clutchs are huge. The eggs will hatch from 10-21 days depending on temps all i did with mine was make sure they are above the water and sprayed them lighty with water on a night for high humidity. I have hatched aprrox 400 snails in a plastic 100L tub with no light and the litte guys are no worse then the other 500+ that were hatched with T5 lights over them so dont worry. you may want to cut a small but of the eggs to keep and throow the rest out beofre they hatch applse snails need 2.5G of water per adult