Zebra Nerite Snail

Geographical Origin and Habitat: Vittina coromandeliana is native to the coastal regions and estuaries of the tropical Indo-Pacific, notably around India, Sri Lanka, Indonesia, and the Philippines. In nature, it inhabits brackish tidal zones, mangrove swamps, and freshwater streams close to the sea, where it experiences fluctuating water conditions.

Taxonomy: Belonging to the family Neritidae and genus Vittina, this species is closely related to other popular nerites. It is frequently misidentified as Vittina natalensis in the aquarium hobby due to their similar striped appearance, but genetic and subtle shell morphology markers differentiate the two species.

Social Behavior: It is a peaceful, non-aggressive invertebrate that spends almost all of its active time scraping algae off solid surfaces. It is completely safe for planted aquariums as it does not consume live plants, only grazing on dead leaves and biofilm. It is active both during the day and night.

Coloration and Sexual Dimorphism: The shell features alternating dark brown to black and golden-yellow stripes that run diagonally or longitudinally. The texture is smooth and polished. There is no visible sexual dimorphism; males and females are anatomically identical from the outside, requiring dissection to determine sex.

Tank Setup: A minimum tank size of 5 to 10 gallons (20-40 liters) is recommended to ensure there is enough natural biofilm and algae growth to sustain them. A tight-fitting lid is mandatory, as nerites are notorious for crawling out of the tank. Provide rocks, driftwood, and broad-leaved plants to maximize grazing surfaces.

Diet and Feeding: They are strict herbivores that feed primarily on green algae, brown diatoms, and bacterial biofilm. They do not eat plants. In clean tanks, supplement their diet with high-quality spirulina wafers, algae sheets, or blanched vegetables like zucchini, though they may sometimes refuse artificial foods.

Water Quality: Keep the water temperature between 72-78 °F (22-26 °C). The pH should be maintained on the alkaline side, between 7.2 and 8.2. Hard water with a GH of 8-20 and KH of 6-15 is essential to provide calcium for shell growth; acidic water will dissolve their shells over time. Heavy metals like copper are highly toxic.

Compatibility and Tankmates: Ideal tankmates include peaceful community fish like tetras, guppies, rasboras, and freshwater shrimp. Avoid housing them with aggressive snail predators such as Puffers, Loaches (e.g., Clown Loaches), Crayfish, or Assassin Snails (Anentome helena), which will easily crack or consume them.

Aquarium Breeding: While they will lay small, capsule-like white eggs on wood and glass, these eggs will not hatch in freshwater. The larvae require brackish or marine water to survive their initial development stages, meaning they will not overpopulate a standard freshwater home aquarium.

Risks and Diseases: Snail starvation is a major risk in pristine tanks. Shell erosion or cracking is common in soft, acidic water due to calcium deficiency. Keepers must also ensure that any medication or plant fertilizers used in the tank are copper-free, as copper exposure is lethal to all invertebrates.