Улитки заполонили аквариум. Что делать?

It's a familiar situation: dozens of tiny snails in an aquarium, which we definitely didn't plan on adding. Some people find this annoying, as it really does ruin the aesthetics, but in most cases, snails aren't a disaster, but a warning sign. They don't appear out of thin air and almost always indicate that the aquarium has available food and conditions for rapid reproduction. Let's explore where they come from, which snails are most common, why they become overpopulated, and how to safely keep their numbers under control without turning the fight into a war with consequences.