Tiger Conch Care Guide: The Sand-Sifting Snail for Reef Tanks

The Tiger Conch (Strombus luhuanus) is one of the most useful sand-bed cleaners in the saltwater hobby — a small, striped gastropod that spends its day plowing through fine substrate, filtering out detritus, diatoms, and cyanobacteria. It is the snail experienced reef keepers reach for when they want a peaceful, fully reef-safe sifter that will not bulldoze coral frags the way a larger fighting conch sometimes can. This guide covers identification, water parameters, diet, tank mate selection, and the substrate considerations that separate a thriving Tiger Conch from one that quietly starves in a too-clean reef.

Species Overview#

Tiger Conchs come from the shallow sandy flats and seagrass beds of the Indo-Pacific, ranging from the Red Sea and East Africa across to the western Pacific. In the wild they live in dense aggregations on sand patches between coral heads, where they spend nearly all their time half-buried, scooping mouthfuls of sand through a flexible proboscis. Hobbyists also know them as "Strawberry Conch" thanks to the warm pink-and-cream interior of the shell's lip.

Adult size

2-3 in (5-7.5 cm)

Lifespan

3-5 years

Min tank

30 gallons (reef)

Temperament

Peaceful

Difficulty

Intermediate

Diet

Detritivore / sand sifter

Identifying Strombus luhuanus by its "Tiger" Patterns and Stalked Eyes#

Tiger Conchs are easy to recognize once you know what to look for. The shell is a heavy, conical spiral about the size of an adult thumb at maturity, marked with bold dark brown to black bands and patches over a cream-to-tan base — the pattern that earned the "tiger" common name. The interior of the lip is a vivid pink to pinkish-orange, often with a deep purple band along the columella, giving the snail its alternate "Strawberry Conch" nickname.

The body is the most striking feature in motion. Tiger Conchs have two long, mobile eye stalks tipped with surprisingly bright, well-developed eyes — far more visible than the dot-eyes of most marine snails. The proboscis extends from below the eyestalks like a flexible elephant trunk, and the muscular foot ends in a sharply curved, hooked operculum used for kicking and self-righting.

Maximum Size (2-3 inches) and Typical Lifespan in Captivity#

Adult Tiger Conchs reach 2-3 inches along the shell's length, smaller than the Florida or West Indian fighting conch but with very similar body proportions. The foot can extend an inch or more beyond the shell when fully active. In a stable reef tank with adequate sand and steady food supply, lifespan runs 3-5 years, sometimes longer when the tank's microfauna population is robust.

Natural Habitat: Indo-Pacific Shallow Sandy Flats#

In the wild, Tiger Conchs live in shallow lagoons and reef flats at depths of just a few feet. They prefer fine carbonate sand mixed with coral rubble, often near seagrass beds where detritus accumulates. This habitat is what dictates their care needs in captivity — they expect warm tropical water, fine sand they can sift, and a steady supply of organic material in the substrate.

Water Parameters & Tank Requirements#

Tiger Conchs need reef-grade water. More importantly, they need a deep sand bed of fine, sortable substrate. A bare-bottom tank or one with crushed coral will starve a Tiger Conch within a few months no matter how clean the water tests.

Ideal Parameters: Temp 72-78F, pH 8.1-8.4, Salinity 1.024-1.026#

Target standard reef parameters: temperature 72-78 F (22-26 C), pH 8.1-8.4, specific gravity 1.024-1.026 (1.025-1.026 matches natural seawater), alkalinity 8-12 dKH, calcium 400-450 ppm, and magnesium 1280-1350 ppm. Nitrate should stay under 20 ppm, with ammonia and nitrite at zero at all times.

Stability matters as much as the absolute numbers. Sudden swings in salinity or pH stress conchs faster than chronically off-target values, so a tank running steadily at 1.024 and pH 8.05 is a healthier home than one oscillating between 1.022 and 1.026 each day.

Minimum Tank Size (30+ Gallons) and the Importance of Open Sand Space#

A 30-gallon reef tank is the practical minimum, with the real limiting factor being open sand surface area rather than water volume. Tiger Conchs are obligate sand-sifters — they need square footage of fine substrate to forage across, not just gallons of water. A 40-gallon breeder with extensive open sand is a much better home than a 60-gallon cube where rockwork covers most of the floor.

Substrate depth matters too. Use fine aragonite or sugar-fine sand at a minimum of 1.5-2 inches across the open floor, three inches if you can manage it. Crushed coral and large gravel are unusable — the grain size is too coarse for the conch's proboscis to process, and the snail will starve while sitting on top of it.

Sensitivity to Nitrates and Copper-Based Medications#

Tiger Conchs tolerate nitrate up to about 20 ppm without obvious stress, but chronic exposure above 30-40 ppm shortens lifespan and slows growth. Bring nitrate down with consistent water changes, healthy macroalgae in a refugium, or a reactor before introducing any inverts.

Copper is acutely lethal. A single dose of Cupramine, copper sulfate, or any copper-based ich treatment in the display will kill a Tiger Conch within 24-48 hours. Copper also persists in rock and substrate for weeks or months, so any tank that has ever been treated with copper should be tested with a dedicated copper kit before adding inverts.

Diet & Feeding#

A Tiger Conch's entire diet comes through its proboscis from the sand bed. It does not graze rocks like a turbo snail or scavenge in the open like a hermit crab. Everything it eats is sieved out of fine substrate, which is why sand-bed health and microfauna density are far more important than what you drop into the tank.

Role as a Detritivore: Consuming Film Algae, Cyanobacteria, and Diatoms#

Active Tiger Conchs spend most of the day plowing slow furrows through the top half-inch of sand. As they move, the proboscis extends, scoops sand, sieves out the edible material, and ejects cleaned grains behind. Their target food is the layer of detritus, fish waste, uneaten food, biofilm, microscopic algae, and tiny crustaceans that builds up on and just below the sand surface.

In a mature reef tank, this layer renews continuously. Detritus settles from the water column, cyanobacteria mats develop on nutrient-rich sand, and copepods, amphipods, and other microfauna live in the interstitial spaces between grains. A single Tiger Conch will keep a 2-3 square foot section of sand visibly turned and clean.

Supplementing with Dried Seaweed (Nori) and Sinking Pellets#

Once the conch has worked the sand bed for a few months, the easy food gets thin. Smart keepers start supplementing before the snail shows visible signs of starvation. Useful options that sink near the substrate:

• Sinking algae wafers — drop one or two near the conch's grazing zone in the evening
• Dried nori — quarter a sheet, weigh it down with a small rock or veggie clip on the sand
• Sinking pellets for marine herbivores or omnivores — small enough that the proboscis can ingest them
• Frozen mysis or finely chopped seafood — occasional protein boost, fed sparingly

Avoid floating foods. The conch lives on the substrate and will not climb rockwork to find food clipped high in the tank.

Signs of Starvation: Lethargy and "Flipping" Behavior#

A starving Tiger Conch reduces foraging activity, retracts deeper into the shell, and may climb the glass or rockwork — a desperation move when sand offers nothing. The proboscis will extend repeatedly without finding food, and the body visibly recedes inside the shell. In late starvation, the snail flips onto its back and fails to right itself, partly because the muscular foot has weakened and partly because there is nothing on the sand worth uprighting for.

Catch starvation early and supplemental food reverses it within a week or two. Wait too long and the snail will decline past the point of recovery even with a packed feeding schedule.

Tank Mates & Compatibility#

Tiger Conchs are among the safest invertebrates you can put in a reef tank. The compatibility risks all run in the other direction — predators that view a slow-moving snail as lunch.

Reef-Safe Status: Why They Won't Bother Corals or Sessile Invertebrates#

Tiger Conchs are 100% reef-safe. They have no biting mouthparts capable of damaging coral tissue, no sting, and they spend almost their entire time on the substrate rather than climbing rockwork. SPS, LPS, soft corals, zoanthids, clams, and anemones are all safe around them. They coexist peacefully with shrimp, other snails, urchins, and reef-safe fish.

The one mild caveat is size-related. A wandering adult conch plowing through sand can occasionally bump a loose coral frag sitting at the sand line. Anchor frag plugs and rubble pieces firmly so the conch's foraging does not topple them.

Dangerous Predators: Hermit Crabs, Triggers, and Puffers#

The threats to a Tiger Conch are predators with crushing jaws, beaks, or grabby claws:

• Large hermit crabs — scarlet reef and electric blue hermits will pull a conch out of its shell to upgrade their housing
• Triggerfish — every species crushes snails as a primary food
• Pufferfish — same beak-crushing problem
• Large wrasses — harlequin tusks, bird wrasses, and several rock-dwelling wrasses prey on snails
• Mantis shrimp — even small species will kill a conch

If your tank houses any of those, skip Tiger Conchs entirely. Stick with dwarf blue-leg hermits over larger species and provide spare empty shells so the hermits do not target your snails for housing upgrades.

Co-existing with Other Sand-Sifters (Nassarius Snails vs. Conchs)#

Tiger Conchs share the sand bed peacefully with nassarius snails, cerith snails, and even larger relatives like the fighting conch. Each species works the substrate slightly differently — nassarius snails respond to scent and emerge from the sand to scavenge fallen food, ceriths graze biofilm in crevices and on the sand surface, and conches plow continuous furrows through the top layer.

The combination is more efficient than any single species. Just stock conservatively. Two adult Tiger Conchs in a 40-gallon footprint will compete for the same food eventually, and one will outpace the other to starvation. As a rule, plan one Tiger Conch per 30-50 gallons of total volume, with the actual limit set by sand-bed surface area.

Common Health Issues#

Tiger Conchs are hardy when their two basic needs are met: stable reef water and adequate food in the sand bed. The problems that kill them are predictable and preventable.

Shell Erosion and the Necessity of Calcium/Magnesium Levels#

The Tiger Conch's heavy shell takes substantial calcium to maintain. A reef tank already dosing two-part for SPS or running a calcium reactor will hit the targets automatically. Tanks running fish-only-with-live-rock setups often run low on calcium and produce conches with thin, eroded, chalky shells over time.

Test calcium and magnesium monthly. If calcium drops below 380 ppm, dose it up before adding more inverts. Low magnesium below 1250 ppm prevents calcium uptake even when calcium itself tests in range — both numbers need to be on target. Low pH and low alkalinity actively dissolve the shell from the outside, so maintain pH at 8.1-8.4 and alkalinity at 8-12 dKH.

The "Righting" Struggle: Helping a Conch That is Stuck Upside Down#

Healthy Tiger Conchs self-right easily. Unlike turbo and astrea snails that often die after a single fall, the conch's powerful muscular foot and hooked operculum let it kick the entire shell upright in seconds. It plants the operculum into the sand, anchors, and flips itself with a sharp jerk.

When a conch fails to self-right, something is wrong. In very fine sugar-sand the operculum sometimes has nothing solid to anchor against, and a manual rescue is fine — gently flip the snail right-side-up onto firmer substrate and walk away. If the snail repeatedly fails to flip even on coarser footing, that is a sign of weakness from poor water chemistry, starvation, or chronic stress, and the underlying cause needs investigation.

Acclimation Stress and the Drip Method#

Tiger Conchs are extremely sensitive to salinity shifts. A 0.002 SG difference between bag water and tank water can shock or kill one on contact. Float-and-dump acclimation is the leading cause of post-purchase mortality.

Always drip acclimate. Float the sealed bag for 15 minutes to equalize temperature, transfer the snail and bag water to a clean bucket, and run airline tubing as a knotted siphon at 2-4 drops per second from the tank. Drip for 45-60 minutes until bucket volume has roughly tripled, then hand-place the conch foot-down on a sandy area of the tank. Discard the bucket water rather than pouring it back.

Where to Buy & What to Look For#

Tiger Conchs are widely available at saltwater-focused local fish stores, especially shops that carry a deep cleanup crew selection. Online reef vendors carry them too, but in-person inspection is far more reliable for assessing health.

Inspecting the "Proboscis" and Eye Stalks for Activity#

The single best test of conch health is watching the proboscis and eyes. A healthy Tiger Conch in a sandy display will be actively extending its long, flexible proboscis to scoop sand, with both eye stalks fully extended and visible above the foot. The motion is constant and unmistakable.

A conch that sits motionless inside its shell, refuses to extend the foot when you tap the glass, or only briefly shows the proboscis before retracting is stressed, starving, or dying. Skip it. Ask the store to gently nudge the snail with a finger or net — a healthy specimen responds quickly by extending the foot and lifting the eye stalks within a few seconds.

Inspect the shell itself under good light. Look for boring sponges (yellow or orange tissue protruding from tiny holes in the shell), pyramid snails (tiny white grains attached to the spire), or visible cracks. A clean tiger-striped shell with a vivid pink lip and an active proboscis is what you want.

Sourcing from Local Fish Stores (LFS) vs. Online Vendors#

A good local fish store lets you watch a Tiger Conch extend its proboscis and stalk its eyes before purchase — a quick test that confirms the snail is actively foraging. You can also check the shell for parasites under bright light before bagging it. Online vendors can ship strong stock, but you cannot run those tests until the conch is already in your tank, and shipping stress alone reduces survival rates compared with locally collected snails.

For a balanced reef cleanup crew, pair a Tiger Conch with a fighting conch for larger sand work, trochus snails for film algae on rockwork, and cerith snails for crevice grazing and additional sand-surface cleanup. A diversified CUC outperforms any single-species stocking strategy. For a complete saltwater system overview, see our saltwater aquarium guide.

Quick Reference#

• Scientific name: Strombus luhuanus (Tiger Conch / Strawberry Conch)
• Adult size: 2-3 inches (5-7.5 cm) shell length
• Lifespan: 3-5 years in stable reef conditions
• Tank size: 30 gallons minimum with significant open sand floor
• Temperature: 72-78 F (22-26 C)
• pH: 8.1-8.4
• Salinity / SG: 1.024-1.026
• Alkalinity: 8-12 dKH
• Calcium / Magnesium: 400-450 ppm / 1280-1350 ppm
• Substrate: Fine aragonite or sugar-fine sand, minimum 1.5-2 inches deep — non-negotiable
• Stocking density: 1 conch per 30-50 gallons; sand surface area is the real limit
• Diet: Detritus, film algae, cyanobacteria, microfauna sieved from sand; supplement with sinking algae wafers or nori in mature tanks
• Tankmates: Reef-safe fish, shrimp, ceriths, trochus, nassarius, fighting conch, dwarf hermits
• Avoid: Triggers, puffers, large wrasses, large hermit crabs, mantis shrimp, copper-based medications
• Acclimation: Drip method required, 45-60 minutes minimum
• Self-righting: Yes — easy on firm substrate; may need help in pure sugar-sand