Saltwater Fish · Shrimp

Peppermint Shrimp

Lysmata boggessi

Shy night-shift shrimp hired to eat AiptasiaIntermediate

Lifespan: 2-3 years
Size: 1.5-2 in
Social needs: Singly or in small groups of 2-3
Time: Minimal beyond reef upkeep
Cost: Low
Diet: Scavenger (Aiptasia anemones, frozen foods, pellets)

Overview

What is this animal?

The peppermint shrimp is a small, translucent western Atlantic shrimp striped in candy-cane red, bought almost exclusively for one job: eating Aiptasia, the stinging pest anemones that plague reef tanks.
Unlike its showy cousin the skunk cleaner shrimp, it is not a dedicated fish-cleaner and spends its days wedged deep in the rockwork, emerging mostly after lights-out.

It is cheap, peaceful, and genuinely effective pest control when you get the real thing.

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That is the catch: 'peppermint shrimp' covers a complex of near-identical Lysmata species, and shops routinely mislabel the coral-nipping camel shrimp (Rhynchocinetes) as a peppermint, so buy from a source that can tell them apart.
Within the complex, a genetic survey of the trade found that most peppermints sold are Lysmata boggessi, collected off Florida's Gulf coast, even when the label says L. wurdemanni.

The giveaway is the body and beak: a true peppermint has a slim, straight body with fine red stripes, while the camel shrimp is visibly humpbacked with a sharply upturned, hinged rostrum.

Temperament

Peaceful toward fish, corals, snails, and other shrimp, the peppermint is a background animal rather than a pet you interact with.
Keepers used to a bold skunk cleaner riding their hand should expect the opposite: glimpses of antennae from a cave by day and cautious foraging at night.

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It is reef-safe with an asterisk: a hungry individual may pinch food from coral mouths and occasionally pick at LPS or zoanthid polyps.
Groups get along fine, and since they are protandric simultaneous hermaphrodites (young shrimp start as males and adults function as both sexes), any two adults can pair and produce larvae, which become live food for the fish.

Check the stocking list both ways before buying: hawkfish, dottybacks, large wrasses, triggers, and puffers all treat a 2-inch shrimp as an expensive snack.

A good fit for

Reef keepers fighting an Aiptasia anemone outbreak
Established, copper-free systems with stable salinity
Budget-friendly additions to a clean-up crew
Keepers happy with a shy, mostly nocturnal animal
Small reefs from 15 gal upward

Common mistakes to avoid

Camel shrimp (humpbacked, hinged beak) sold mislabeled as peppermints: they nip coral
Well-fed individuals may ignore Aiptasia entirely
Fast acclimation: osmotic shock kills on day one
Copper medications anywhere in the system
Hungry shrimp picking at LPS and zoanthid polyps
Predatory tankmates: hawkfish, dottybacks, triggers, puffers

Enclosure

Minimum 15 gallons

Fine alone or with company. Singly or in small groups of 2-3

Give one shrimp a mature, stable reef of 15 gallons or more, with plenty of rockwork caves and overhangs because this is a cryptic, nocturnal animal that needs daytime cover.
Small groups of two or three work well in larger tanks, at about one shrimp per 10-15 gallons, and hunt Aiptasia more thoroughly than a lone shrimp.

Keep salinity locked at 1.025-1.026 (about 35 ppt) and temperature at 75-79°F, with no copper anywhere in the system.

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Like all Lysmata shrimp it tolerates far less parameter swing than fish do, so sloppy top-offs and rushed water changes are the real hazards.

Do not add it to a brand-new tank; wait until the system has been cycled and stable for a couple of months so there is biofilm and detritus to graze between meals.

Check your enclosure

Supplies

Setup

Tank, stand and sump
Return pump and powerheads
Protein skimmer
Reef lighting
Rock and sand

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Salt mix, refractometer and test kits
Quarantine tank

Ongoing

Sinking marine pellets
Frozen mysis shrimp
Frozen chopped seafood blend
Feeding tongs
Turkey baster for target-feeding
Small thawing cup and strainer

Safe substrate: Aragonite sand · Dry or cured live rock

Work out the cost

Care routine

Daily

Check salinity, temperature and flow
Head-count and look everyone over
Top up evaporation with fresh water

Every few days

Service the skimmer and filter socksevery 3 days
Target-feed the shrimpevery 3 days

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Weekly

Check for moults
Clean the glass
Test the water
Water change

Monthly

Calibrate the refractometer
Check labels for copper
Check salt, RO/DI and reagents

Less often

Deep-clean pumps and powerheadsevery 3 months
Replace RO/DI filter mediaevery 6 months

Health review: Quarterly moult and stability review, every 3 months

Tools

Is your enclosure big enough?Check your measurements against the recommended size What will it cost?Setup, monthly and over its whole life, itemised Is this ammonia reading dangerous?Works out the toxic part from your pH and temperature

Care in depth

Diet

Scavenger (Aiptasia anemones, frozen foods, pellets)

Aiptasia is the headline, and a hungry peppermint shrimp will mow down small and medium anemones, often overnight.
Be honest about the limits: individuals vary, large established anemones are frequently ignored, and a shrimp kept well fed on easier food may never touch an Aiptasia at all.

Beyond pest control it is a scavenger, picking over rockwork for detritus and leftovers after dark.
Target-feed a few sinking pellets or frozen mysis a couple of times a week so it does not go hungry, but keep portions lean while an Aiptasia outbreak is being cleared.

A genuinely underfed peppermint will start picking at easier targets, including LPS coral polyps and zoanthids, so the balance is lean feeding, not starvation.

Health

Signs of good health, and the common problems

Acclimation is the make-or-break moment, as with all ornamental shrimp: drip-acclimate over at least an hour, because osmotic shock from a quick transfer is the classic first-day killer.
Copper-based medications are lethal to it at trace levels, so never treat the display and never reuse copper-dosed equipment.

Regular moulting is normal: you will find a perfect ghost shell on the sand and the shrimp will hide for a day or two while its new shell hardens.
Failed or incomplete moults usually point to unstable salinity or low calcium or magnesium, so steady reef-standard alkalinity and mineral levels are the fix.
Low iodine is often blamed, but the evidence is thin and an overdose harms invertebrates, so never dose iodine without a test.

Expect a working lifespan of two to three years even in a well-run tank, and factor that into how attached you get.

Is this urgent?

6 warning signs and how fast to act, 3 of them right away

In a reef, stability matters more than any single target number. A parameter moving fast does more damage than a parameter sitting slightly off.

Go now

Any detectable ammonia or nitriteWater change now with matched, mixed and aerated saltwater. Stop feeding. Ammonia is directly toxic, and at reef pH more of it is in the toxic form, so a marine system has less margin than a freshwater one. Nitrite is far less toxic in seawater, but any reading in a stocked tank means the biological filter is not keeping up.

Now

Temperature or salinity has moved sharplyCorrect slowly, over hours, not minutes. Check the heater and the top-off. The speed of the change does the damage. Correcting fast repeats the injury in the other direction.

Now

Rapid gilling, or a fish hanging in the flow breathing hardIncrease aeration and check temperature and salinity. Warm water holds less oxygen, and a heater failure shows up here first.

Now

Today

White spots, or a fine dusting like icing sugarIdentify which parasite before treating. Most reef tanks cannot be treated in place. The two common parasites look similar and need different handling; velvet can kill a tank in days.

Today

Corals closed for more than a day, or receding tissueTest alkalinity first, and compare it against the last reading rather than a target. Unstable alkalinity is the most commonly cited coral killer, and a swing shows up in the trend, never in a single point.

Today

A new fish added without quarantine now looks unwellRemove it to a separate system today if you can. Nearly every wipeout in a reef tank traces back to a skipped quarantine.

Today

Quarantine every new animal, including corals and inverts. It is the single practice that separates a reef that lasts from a reef that restarts.

This is general guidance for a healthy adult, not a diagnosis. An exotics vet who knows your animal always overrides it, and the time to find one is before you need one.

Bedding and substrate

2 safe, 3 with a caveat, 2 to avoid

In a marine system the rock and the sand are life support, and how you start them decides the first six months.

Safe

Aragonite sandThe standard marine substrate, and it hosts the biology. It does not meaningfully hold pH or alkalinity at normal reef pH, so test and dose for those regardless.

safe

Dry or cured live rockDry rock avoids importing pests but takes longer to mature. Cured rock is faster and riskier.

safe

With a caveat

Deep sand bedsPowerful nutrient processing when they work and a sulphide release when they are disturbed. Choose shallow or deep deliberately, not by accident. A sand-sifting or burrowing goby needs a fine bed about 2 to 3 in deep that it turns over itself. That is a different thing from a denitrifying deep sand bed (4 in or more, left undisturbed), and the two do not mix: a sifting goby disturbs the layers a deep sand bed depends on and eats the life in it.

with a caveat

Uncured live rockIt will cycle the tank for you, and it will also bring in whatever was living in it.

with a caveat

Bare bottomWorkable in high-flow systems for fish that neither sift nor burrow, but it removes a large part of the biological buffer. Wrong for watchman gobies and other gobies that burrow or sift, which need a fine sand bed at least 2 in deep to dig and feed in, and for mandarins and other copepod-eaters, which need sand as well as mature rock for their food to breed in.

with a caveat

Never

Silica play sandNot the marine standard, and commonly blamed for feeding diatom blooms in a new tank.

never

Any rock or decor of unknown originMetals and phosphate leach for months and are almost impossible to trace once the tank is running.

never

This is our general list for saltwater fish. We have not built one specific to Shrimp yet.

Top resources for more info

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