The large, iconic pink-lipped conch of the Caribbean — beautiful and a capable sand-sifter, but a poor practical aquarium choice: it grows enormous (up to a foot of shell), needs a big sand footprint and prodigious algae, and is legally fraught. It is CITES Appendix II listed and 'Near Threatened,' so wild harvest and trade are regulated and, in places like Florida, taking live queen conch is prohibited. Best appreciated as an educational entry rather than a starter cleanup snail.
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Educational only. KinStation content is reviewed by licensed veterinarians but cannot replace an in-person exam. Always consult a licensed veterinarian or board-certified specialist for diagnosis, treatment, or any decision affecting your pet's health.
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Very large: shell commonly 15-31 cm (6-12 in), up to about 35 cm (14 in).
Lifespan
7–30 years
Social needs
solo
Native region
Tropical western Atlantic and Caribbean (Florida and Bermuda to northern South America)
Origin
New World
Climate
🌴 Tropical
Water type
🌊 Marine
Family
Strombidae
Genus
Aliger
Part of the Conchs
Large marine gastropods that plow and sift sand beds as living detritus and algae clean-up crew. Distinctive for their 'hopping' leaping foot, stalked eyes and heavy flared shells, most are peaceful sand-bed specialists — though a few relatives are predatory and not reef-safe.
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Larva
Most marine invertebrates hatch into microscopic planktonic larvae (such as the zoea of crustaceans or the bipinnaria/veliger of echinoderms and mollusks) that drift and feed in the water column. The larva looks nothing like the adult and undergoes major reorganization.
Photo coming soon
Juvenile
After settling out of the plankton, the juvenile takes on a recognizable miniature of the adult body plan — a tiny shell, a small star, or a translucent shrimp. Crustaceans grow by molting, shedding the exoskeleton to enlarge.
Photo coming soon
Adult
Adults reach full size and reproductive maturity with the species' mature shell, shape, or coloration. Many continue to molt or grow throughout life, and some show sex differences in size or claw/appendage shape.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
Natural
Pink-lipped (typical)
The classic form, with a large heavy spired shell and the flared, glossy pink-to-rose aperture lip that gives the 'pink conch' name. A natural species, not a bred strain; harvest and trade are regulated.
Habitat & enclosure
Realistically this animal needs far more space than most home tanks offer: a very large system (well over 100 gallons / 400 L) with a broad, deep, open fine sand bed and a huge standing crop of algae to sustain its growth and grazing. Keep stable tropical reef parameters: temperature 72-82F (22-28C), pH 8.1-8.4, salinity SG 1.024-1.026, alkalinity 8-11 dKH and low nitrate.
It is native to the tropical western Atlantic and Caribbean, from Florida and Bermuda to northern South America, on shallow sand flats and seagrass meadows. The encyclopedia documents it largely for identification and as a cautionary, mostly-impractical species rather than a recommended cleanup buy.
Substrate
A broad, deep, fine sand bed is essential — far more open sand area than a typical reef provides, since it plows and partly burrows while grazing a large footprint. Bare-bottom or small-footprint tanks are entirely unsuitable.
Equipment & setup
Beyond standard marine gear (live-rock biofiltration, heater, skimmer, moderate flow), the practical requirements are sheer tank volume and sand-bed area plus a feeding regime able to satisfy a large grazer. No special lighting is needed.
Diet
A sand-bed herbivore and detritivore that grazes large quantities of algae, diatoms, seagrass detritus and epiphytes. Its appetite scales with its size, and a young queen conch will quickly exhaust the algae in a normal tank and then starve, so it must be heavily supplemented with seaweed and sinking foods — one more reason it suits only very large, food-rich systems or public aquaria.
Behavior & temperament
Peaceful and reef-safe in behavior — it plows the sand on the strong clawed strombid foot, leaps rather than glides, and watches with prominent stalked eyes. The problems are scale and law, not temperament: it gets too big for most displays and can bulldoze loose aquascaping, and as a protected species its collection and movement are restricted.
Health
Sensitive to copper, salinity swings and air exposure like all marine snails; drip-acclimate and never use copper meds. The dominant issue for keepers is mismatch — a foot-long, slow-growing, decades-living animal placed in a tank that can neither feed nor house it, leading to slow starvation. LEGAL NOTE: Aliger gigas is listed on CITES Appendix II and assessed as Near Threatened; international trade is regulated and some jurisdictions (e.g. Florida) prohibit taking live specimens. Verify the legality and provenance of any specimen before acquiring it. (Educational only, not veterinary or legal advice — confirm current regulations with the relevant authority.)
Tips, DIY & hacks
For nearly all hobbyists the best advice is to admire it and choose a smaller sand-sifting conch (fighting or tiger conch) instead. If you keep one, confirm it was legally and sustainably sourced, commit to a very large tank and heavy supplemental feeding, and remember it can live for decades and reach a foot long.
Reviewed and signed off by: KinStation Editorial — pre-launch draft (pending DVM review) on 2026-06-09