Peppermint Shrimp

Overview

General Description: A small, mostly nocturnal reef shrimp valued as a scavenger and for its tendency to consume pest Aiptasia anemones. Results vary by individual, species identification, tank conditions, and available foods.

Appearance: A translucent body crossed by fine red longitudinal and diagonal lines, giving a peppermint-candy appearance. The pattern is less strongly arched than that of the similar camel shrimp.

Behavior: Shy by day and more active after lights-out. It searches rockwork for leftover food, small organisms, and sometimes Aiptasia.

Ecological Role: Scavenges organic matter and may prey on small benthic organisms or anemones. In aquariums it can contribute to cleanup but does not replace maintenance.

Notable Characteristics: Known for possible Aiptasia control, cryptic nighttime activity, and frequent confusion with other members of the western Atlantic peppermint-shrimp complex.

Natural Habitat

Native Distribution: Western Atlantic; L. boggessi is associated particularly with Florida and Gulf of Mexico waters. True L. wurdemanni has a more northerly western Atlantic distribution.

Natural Habitat: Shallow coastal and reef habitats, including rocky crevices, sponge-associated areas, seagrass, hard-bottom habitat, and sheltered rubble.

Depth: Mostly shallow subtidal habitat; exact depth varies among peppermint-shrimp species and collection areas.

Substrate: Rock, rubble, sand, or mixed hard-bottom habitat; it does not require a special aquarium substrate.

Natural Flow: Low to moderate flow with calm crevices available for shelter.

Other Habitat Notes: Often found hidden in groups or aggregations in suitable habitat, unlike the conspicuous cleaning-station behavior of skunk cleaner shrimp.

Aquarium Setup

Minimum Tank Size: 10 gallons minimum; 20 gallons or larger is recommended for better stability and compatibility.

Rockwork: Provide mature live rock with numerous narrow crevices and shaded overhangs for daytime shelter and molting.

Substrate: Any reef-safe sand, gravel, or bare bottom. It does not burrow.

Hiding Places: Several tight, predator-free crevices, especially when keeping a group.

Lighting: Any normal reef lighting; shaded retreats are essential because the shrimp is usually nocturnal.

Water Flow: Low to moderate around shelters; avoid strong direct jets at its preferred hiding place.

Space Requirements: Requires little open space but enough rockwork and feeding access to reduce competition. Groups need multiple retreats.

Special Setup Requirements: Use guarded pump intakes, stable rockwork, slow acclimation, and a copper-free display. Observe it after dark to confirm feeding and behavior.

Water Parameters

Temperature: 72-78°F (22-26°C)

Salinity: 1.023-1.026 specific gravity (about 32-35 ppt)

pH: 8.1-8.4

Alkalinity: 8-12 dKH

Calcium: 400-450 ppm

Magnesium: 1250-1400 ppm

Other Relevant Parameters: Ammonia 0 ppm; nitrite 0 ppm; keep nitrate controlled. A quality salt mix and routine water changes normally supply needed trace elements; do not dose iodine without testing.

Parameter Sensitivity: Sensitive to ammonia, copper, abrupt salinity changes, overheating, and poor acclimation.

Stability Requirements: Keep temperature and salinity steady, match new water during changes, and replace evaporated water with fresh water rather than saltwater.

Behavior

General Behavior: Secretive, peaceful toward fish, and opportunistic around food. Most activity occurs within and around rockwork.

Activity Period: Primarily nocturnal or crepuscular; it may become bolder during feeding or after becoming established.

Aggression: Low toward fish. It may compete with other shrimp and can nip vulnerable invertebrates or steal coral food when hungry.

Territorial Behavior: Usually not strongly territorial, though crowding, limited shelters, and food competition can cause conflict.

Social Requirements: May be kept singly or in a small group when the aquarium has adequate space, food, and hiding places. Monitor new groups for harassment.

Molting Behavior: It often hides and eats less before shedding. A clear empty shell is normal. Leave secure cover while the new exoskeleton hardens.

Burrowing/Grazing Behavior: Scavenges rock surfaces and crevices but does not burrow and is not a dependable algae eater.

Other Notable Behaviors: Aiptasia consumption is not guaranteed. Some individuals ignore large anemones, eat only small ones, or stop hunting them when easier food is abundant.

Compatibility

Fish Compatibility: Compatible with peaceful clownfish, gobies, blennies, cardinalfish, and other reef fish too small-mouthed or mild to prey on shrimp.

Coral Compatibility: Usually reef safe, but it may rob food from corals and occasionally irritate or pick at fleshy LPS, soft corals, anemones, or stressed tissue.

Invertebrate Compatibility: Generally compatible with snails and peaceful cleanup animals. Use caution with large crabs, coral-banded shrimp, and other competitive shrimp.

Same-Species Compatibility: Often kept in groups, but success depends on space, shelter, and food. Quarantine and introduce similarly sized animals when possible.

Predators: Hawkfish, lionfish, groupers, triggers, puffers, larger wrasses, moray eels, and other crustacean-eating fish.

Use Caution With: Fleshy corals, ornamental anemones, very small shrimp, aggressive crabs, coral-banded shrimp, and food-poor systems.

Avoid: Shrimp-eating fish, copper-treated or immature systems, camel shrimp sold as peppermint shrimp, and tanks containing valuable tiny anemones or delicate polyps if risk is unacceptable.

Diet & Feeding

Natural Diet: Detritus, carrion, small crustaceans and worms, planktonic foods, and small anemones or other benthic organisms.

Captive Diet: A varied omnivorous diet. Aiptasia and leftovers are not a complete or dependable food supply.

Recommended Foods: Mysis shrimp, finely chopped marine flesh, enriched brine shrimp, sinking pellets, flakes, and small portions of frozen reef food.

Feeding Frequency: Feed a small amount daily or at least several times per week, accounting for food collected during normal fish feeding.

Feeding Method: Place sinking food near its cave after lights dim. Target-feed with a pipette or baster if fish consume everything first.

Scavenging/Grazing: Useful for leftover food in crevices, but not a substitute for siphoning detritus, controlling nutrients, or direct feeding.

Special Nutritional Requirements: No special supplement is normally necessary with varied foods, stable reef chemistry, and regular water changes.

Sexing & Breeding

Male/Female Differences: Juveniles function first as males. Mature animals become simultaneous hermaphrodites capable of producing eggs and fertilizing another mature shrimp.

Breeding Difficulty: Moderate to advanced

Reproductive Strategy: Protandric simultaneous hermaphroditism. Two mature shrimp can mate, and an egg-bearing individual broods the clutch beneath its abdomen.

Eggs/Larvae: Eggs are carried on the pleopods until numerous planktonic larvae hatch, commonly after dark. Larvae are usually eaten or filtered out in a display tank.

Larval Requirements: A separate larval tank, gentle aeration, live planktonic foods, stable clean seawater, and careful management through repeated molts are required.

Captive Breeding: Adults reproduce readily and the larvae are considered more manageable than those of some ornamental shrimp, but raising them through settlement still requires dedicated culture methods.

Health & Special Sensitivities

Common Health Problems: Poor water quality, copper exposure, acclimation shock, starvation, predation, and molting failure are more common than recognizable infectious disease.

Molting/Shell Problems: Failed or incomplete molts can follow salinity swings, poor nutrition, injury, or unsuitable chemistry. Never pull retained shell from the shrimp.

Copper Sensitivity: Extremely sensitive; copper medication can be lethal and residues may remain in substrate, rock, or equipment.

Medication Sensitivity: Avoid any treatment not explicitly safe for marine crustaceans. Move fish to a separate hospital tank for copper or other invertebrate-toxic medication.

Starvation Risk: Moderate in very clean, sparsely stocked, or highly competitive tanks, particularly after Aiptasia is depleted.

Signs of Stress: Persistent hiding combined with not eating, frantic swimming, loss of coordination, unusual stillness in the open, discoloration, or repeated molting trouble.

Common Keeper Mistakes: Buying a misidentified shrimp, expecting guaranteed Aiptasia removal, adding it before the tank matures, skipping gradual acclimation, using copper, and failing to feed it after pests decline.

Beginner Suitability

Beginner Friendly: Yes, with a mature, stable, and predator-free marine aquarium.

Why: It stays small, accepts common foods, needs modest space, and is generally peaceful and reef safe.

Major Challenges: Correct identification, sensitivity to water changes and copper, shy behavior, variable Aiptasia performance, and possible picking at corals or ornamental anemones.

Before You Buy

Important Considerations: Purchase from a seller who can identify the species and origin. The aquarium trade name 'peppermint shrimp' covers multiple similar animals with different behavior.

Compatibility: Confirm that every fish and crustacean is shrimp-safe. Observe interactions after dark, when this shrimp is most active.

Diet: Plan regular supplemental feeding even if it is purchased for Aiptasia control.

Adult Size: About 1.5-2 inches (4-5 cm), plus antennae.

Special Requirements: A mature copper-free tank, slow acclimation, guarded intakes, shaded crevices, and stable salinity and temperature.

Long-Term Care: Continue feeding after Aiptasia disappears, maintain safe molting shelters, and watch for coral-food theft or unwanted picking.

Species-Specific Information

Anything important that does not fit above: Modern research shows that aquarium-trade 'peppermint shrimp' comprise several similar species. A 2017 integrative taxonomic study found that sampled aquarium-trade animals identified as L. wurdemanni were actually L. boggessi. Camel shrimp (Rhynchocinetes spp.) are different animals; their more strongly arched red pattern, pronounced hump, and articulated rostrum help distinguish them, and they are less reliably reef safe. Never release aquarium shrimp into local waters.