from what I read, and not that much yet, the baby trapdoors, don't have trap doors so they are easily eaten. They reccomend to remove them and let them grow out in an aquarium. If they are pond snails that came in on plants as eggs, BTW you won't see the eggs, like Koiguy said you will have a ton of them. If you can keep your water well maintained they wont get too out of control, but if you have food for them, they will multiply quickly.