Military Helmet Snail Care Guide - Setup, Feeding & Breeding

The Military Helmet Snail is a robust nerite with a rounded, helmet-like shell that is usually dark brown, black or olive, sometimes marked with subtle bands or irregular patterns. Its substantial shell and strong, muscular foot give it a distinctive, armoured appearance as it moves across hard surfaces.

This snail is valued for its steady grazing behaviour. It uses its rasping mouthparts to scrape algae and soft biofilm from glass, rocks, wood and other surfaces, while remaining peaceful and unobtrusive around fish and other invertebrates.

In nature, Neritina pulligera inhabits flowing tropical waters, often clinging to stones, submerged wood and other firm surfaces where currents bring oxygen and encourage algae growth. Its ability to live in environments connected to both freshwater and coastal water is an important part of its life cycle.

Military Helmet Snails are mainly active after dark or under subdued lighting. They are capable climbers and may explore above the waterline, and their broad, dark shell makes them one of the more substantial and recognisable nerite snails commonly kept by aquarists.

Neritina pulligera is native to tropical and subtropical parts of the Indo-Pacific, including river systems and estuarine areas across Southeast Asia, the western Pacific and parts of East Africa. It is typically found in freshwater streams and rivers with access to brackish or marine coastal waters.

A single Military Helmet Snail is best kept in an aquarium of at least 40 litres, with a footprint around 60 cm long by 30 cm wide or larger. Provide mature, stable water, good oxygenation and plenty of algae-covered glass, rocks and driftwood to graze. Smooth surfaces, secure hardscape and a tight-fitting lid are useful because these snails may climb above the waterline. Neutral to moderately alkaline water with adequate calcium supports healthy shell growth, and fine gravel or sand is suitable, although the snail spends most of its time on solid surfaces.

Up to approximately 4.5 cm (1.8 inches) in shell length. Females are often slightly larger and broader-bodied than males, although individual size varies.

Their main food is naturally growing algae and biofilm on aquarium surfaces. They should be offered algae wafers, spirulina-based foods and blanched vegetables such as courgette or spinach when natural growth is limited. A varied mineral-rich diet helps support shell condition, but uneaten food should be removed before it spoils.

Military Helmet Snails are peaceful and can be kept with small, non-aggressive community fish such as tetras, rasboras, danios, livebearers, peaceful gouramis and Corydoras. They also suit aquariums containing other peaceful snails and shrimp. Avoid pufferfish, loaches, large cichlids, aggressive fish and any species that attacks or eats snails, as well as copper-based medications, which are highly toxic to invertebrates.

Military Helmet Snails lay small, hard white egg capsules on wood, rocks, glass and other solid surfaces. The eggs hatch into free-swimming larvae, but these larvae require brackish or marine conditions and specialised food to develop successfully. As a result, they rarely complete their life cycle in freshwater aquariums, and routine freshwater breeding is not generally achievable.

Males and females look very similar externally, and reliable sexing usually requires close examination during mating or breeding activity. Females are generally somewhat larger and more robust, while males tend to be slightly smaller and slimmer.