Fighting Conch
Strombus alatus
The sand-bed cleaner that isn't a fighter — it plows the substrate for detritus and algae.
Difficulty: BeginnerCleanup crewReef-safe
Don't let the name fool you — the fighting conch (Strombus alatus) is one of the most peaceful, useful animals you can add to a sand bed. It spends its day half-buried, plowing through the substrate and scooping up detritus, diatoms, film algae and leftover food, keeping the sand clean and turned. The one requirement is right there in the job: it needs an actual sand bed.
Care at a glance
| Adult size | Around 2.5–3.5 in. |
|---|---|
| Minimum tank | An established tank with a sand bed — ideally 30+ gallons for enough sand to graze; one conch suits most tanks. |
| Temperature | 75–82°F (24–28°C). |
| pH | 8.1–8.4. |
| Specific gravity | 1.023–1.026 (reef-standard ≈35 ppt). |
| Other targets | Standard reef calcium and alkalinity keep the shell healthy; like all inverts it has zero tolerance for copper. |
| Diet | Detritus, diatoms, film algae, fine hair algae and leftover food, sifted from the sand bed. |
| Temperament | Peaceful and reef-safe — despite the name (the "fighting" refers to wild males sparring, not tank behaviour). |
| Reef-safe | Yes — it works the sand and won't touch corals. |
| Natural range | Western Atlantic / Caribbean. |
The fish store gets these wrong
Common myths, kindly corrected — no shame for having believed them.
- "A fighting conch is aggressive." The opposite — it's peaceful and reef-safe. The name refers to wild males sparring, not anything it does in your tank.
- "It'll clean the whole tank." It's a sand-bed specialist — pair it with glass and rock grazers for the rest.
Before you buy
- An established sand bed a few inches deep — essential; not for bare-bottom tanks.
- A tank producing enough detritus and algae to feed it.
- One per tank is usually plenty; drip-acclimate; never any copper.
Signs something's wrong
A struggling invert is usually telling you about water quality, acclimation, or (for shrimp and crabs) a fresh moult — here's what to watch for:
- Sitting on top of the sand and inactive, not burrowing — check the bed depth and food supply, and your parameters.
- Not righting itself after a long time — conchs CAN right themselves, so persistent trouble points to a water-quality issue.
Never
- Never keep one bare-bottom — it needs sand.
- Never assume a spotless tank feeds it.
- Never add to an un-cycled tank, dose copper, or drop it straight in.
Common fighting conch questions
Is the fighting conch actually aggressive?
No — it's peaceful and reef-safe. The name comes from wild males sparring over territory; in the aquarium it just plows the sand eating detritus and algae.
Do fighting conchs need a sand bed?
Yes — it's essential. They're sand-sifters that spend the day half-buried scooping substrate, so a bare-bottom tank will starve one. Give it an established bed a few inches deep.
What does a fighting conch eat?
Detritus, diatoms, film algae, fine hair algae and leftover food, all sifted from the sand. It's a sand specialist — it won't clean glass or rock.
How many fighting conchs can I keep?
Usually one per tank — they need a lot of sand-bed area each, so several will compete for food unless the tank is large.
Can a fighting conch flip itself over?
Yes — unlike some snails, conchs have a strong foot and can right themselves. A conch that stays stuck or inactive usually signals a water-quality or food problem, not a flipping issue.
Sources & further reading
This guide was written and fact-checked against these authorities. It's honest, general guidance — not a diagnosis, and not a substitute for an aquatic vet or your own test kit:
- Reef Cleaners — Florida Fighting Conch — sand-sifting role, diet, reef-safe
- Top Shelf Aquatics — Fighting Conch — care, sand bed
- Fish Stores — Fighting Conch Care — size, diet, reef compatibility
Written and fact-checked by The Coralkin Team against marine-aquarist sources — if your fighting conch is struggling, it's almost always water quality, acclimation or a moult — check those first and ask an experienced reefer. We never guess a care number.
🔬 Review status: team-written and fact-checked against cited sources · not yet reviewed by a marine vet. How we research & fact-check →