Distorted nassarius snail (Nassarius distortus) care guide

Group
Snails
Other names
Distorted nassa, Nassarius snail, Nassa distorta, Nassarius monile, Necklace nassa
Family
Nassariidae
Origin
Indo-West Pacific, including Queensland, Australia
Water
saltwater
Maximum size
3.5 cm
Temperature
22–26°C
pH
8.1–8.4
Hardness
dKH 8–12, SG 1.023–1.025
Minimum tank
40 litres
Care level
beginner
Reef safe
yes
Lifespan
2–4 years

Care

The distorted nassa is a small Indo-West Pacific sand snail whose shell is 1.8–3.5 cm long, smooth, polished and whitish, with a rose-coloured band below each suture and three bands around the last whorl. A row of rounded knobs along the suture looks like a necklace. Nassarius monile and Nassa distorta are among its older names. In the trade most nassarius are sold simply as 'Nassarius sp.', and LiveAquaria offers Indo-Pacific and Caribbean forms under that name. Set-up: it needs a sand bed, ideally 5 cm deep or more, because it spends most of its time buried with only its siphon showing. A mature tank with live rock is best. LiveAquaria gives 22–26 °C, pH 8.1–8.4, dKH 8–12 and SG 1.023–1.025, and notes sensitivity to high nitrate. Clean-up crew: nassarius do not eat algae. They are scavengers that come out of the sand, often within seconds of food reaching the bottom, to eat leftover food, dead animals, fish waste and detritus. Their burrowing turns over the top of the sand and stops it compacting. Stock a small group in line with how much food reaches the sand; too many in a lightly fed tank will starve. Copper: copper-based medicines and some plant fertilisers are toxic to shrimp, snails and most other invertebrates. Never treat a tank holding them with copper, check the label of any fertiliser or medicine, and keep nets and buckets used for copper-treated tanks separate. LiveAquaria notes nassarius are sensitive to copper-based medicines. Sources: LiveAquaria (liveaquaria.com/products/nassarius-snail); Wikipedia (en.wikipedia.org/wiki/Nassariusdistortus). Checked October 2026.

Diet

A carnivorous scavenger. It eats leftover meaty food, carrion, fish waste and detritus. In a lightly fed tank, drop a few pellets or a little frozen mysis onto the sand for it every few days.

Breeding

Sexes are separate. Nassarius often lay rows of small egg capsules on the glass or rock, and the larvae are planktonic, so young rarely survive in aquariums. LiveAquaria calls them extremely difficult to breed in captivity.

Compatibility and tank mates

Peaceful and reef safe; it will not harm corals, fish or other invertebrates. It may itself be eaten by hermit crabs, sand-sifting starfish, wrasses, triggers and puffers. Empty shells may be taken over by hermit crabs.

Last updated 8 October 2026. Community-edited care guide on Aquatic-Auctions.

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