You don't have to worry about population explosions with Mystery snails. They don't breed until they're about one inch big and you need a male and female, as opposed to many hermaphrodite snails. They also lay their eggs above the water line so if you don't want babies, you simply remove the clutch. My snails are magenta, but they also come in purple, black, gold, ivory, blue and chestnut. Probably others as well. Very cool snails!! It's a fallacy that snails only eat algae, in fact, that shouldn't be their only diet. Flake food, shrimp pellets, bloodworms, and veges should be offered.