Trapdoor snails qty 3 snails Viviparus malleatus Yes these are legal. We verified that. Trapdoor snails are fantastic as algae cleaners in your ponds, tubs, or tanks. These can live 5-10 years so much longer than a mystery or nerite. These snails will not only eat algae but leftover foods as well . They do not bother live healthy plants. Another cool fact about these are that they are a livebearer so they will not leave eggs around.