Snails in the aquarium are great at keeping the aquarium clean. Fast-reproducing snails and other savaging snails are good at cleaning up excess waste. An explosion of them can be the canary in the coal mine to tell you to feed less. While other snails can be great algae eaters, mainly the Nerite snails, which can eat algae that would otherwise be too hard for other algae eaters.
Nerite Snail
Assassin Snail and Ramshorn Snail
If you want to get rid of snails, a group of Assassin snails is a slow but nearly guaranteed way to get rid of all of them. They have a proboscis with teeth that they insert into other snails’ shells and eat them alive. They also forge using this proboscis and rely on their sense of smell to catch prey. Interestingly, their eggs take months to hatch. So, they are easy to control population-wise due to their long reproduction cycle. In addition, assassin snails are particularly easy to sell due to snail-eating abilities.
Rams horn snails can reproduce sexually and asexually (technically, they are hermaphrodites and do not truly reproduce asexually), allowing them to quickly take over an aquarium. Uniquely compared to many other aquatic snails, it contains hemoglobin, the protein that carries oxygen to our blood and makes blood red. This adaptation likely helps it to survive in oxygen-depleted environments.
Rabbit Snail
Mystery Snail