10 Live Marbled Purple Snails + Java Moss by InvertObsession
These snails are one of the most voracious eaters and breeders that I keep. They will destroy algae in an aquarium or pond very quickly, and will easily breed in almost any aquarium. You can start a large colony for a pond or multiple aquariums within a few months of getting these 10 in the mail. They grow to about 1" at maximum size, and are interesting for a snail in that they move very fast. These are by far the fastest moving snails I have seen despite their small size. They ship as small juveniles that you may lose track of for a while, but within 3 months you will have adults and more babies on the way.  These snails usually prefer to hang out on the walls of your aquarium, but can also be found scavenging on plants or on the tank floor.