Ever look in your snail tank and see what looks like bubblegum stuck to the glass? Well, they are actually egg clusters. If any of you keep Mystery snails you may encounter these bubblegum like globs on your tank walls. Mystery snails will form clusters of pink egg sacks that will appear right above the waterline, including on your tank lid if you have one.
If you want to avoid an impending on-slot of new snails, I would quickly remove these clusters as soon as you see them appear. If they have already started hatching, you should easily be able to pull them from your tank. Thankfully, there are always Assassin snails to fully get rid of them.