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Pistol Shrimp
Alpheus randalli
Animalia›Arthropoda›Malacostraca›Alpheidae
📍 Indo-Pacific sandy reef flats
Famous for its symbiosis with watchman gobies — the shrimp digs a burrow and the goby guards the entrance. Pairs perfectly with Yellow Watchman or Randall's Pistol Goby. Produces a loud snapping sound.
Care Guide
Diet
Pistol shrimp are omnivorous scavengers that feed on detritus, small crustaceans, and meaty foods. Offer a varied diet including high-quality sinking pellets, frozen mysis shrimp, and frozen brine shrimp 2-3 times weekly. They will also consume leftover food and organic debris from the substrate, making them excellent cleanup crew members.
Behavior
These shrimp are famous for their symbiotic relationship with watchman gobies, where the shrimp digs and maintains a burrow while the goby stands guard at the entrance. They produce a distinctive loud snapping sound from their oversized claw, which they use for communication and hunting. Pistol shrimp are generally semi-aggressive toward other shrimp but tolerate their goby partners well.
Breeding
Breeding pistol shrimp in captivity is difficult and rarely successful in home aquariums. They require specific water conditions and the pair must be well-established and undisturbed. Larvae are planktonic and require specialized rearing conditions, making captive breeding impractical for most hobbyists.
Tank Mates
Ideal symbiotic partner; the goby guards the burrow while the shrimp digs and maintains it
Peaceful reef fish that won't prey on or harass the shrimp in larger tanks
May compete for food and territory; only house together in larger tanks with multiple hiding spots
Small, peaceful goby that shares similar habitat preferences without direct competition
Algae-eating snail that won't compete for food and helps maintain water quality
Common Diseases
Bacterial Shell Infection
Discoloration, soft spots, or lesions on the exoskeleton; lethargy and loss of appetite
Improve water quality, perform regular water changes, and maintain stable parameters. Quarantine affected individuals and consider antibiotic treatments if severe
Parasitic Infection
Excessive molting, white spots on body, erratic swimming, and visible parasites on gills or body
Quarantine the shrimp, perform freshwater dips (brief, 1-2 minutes), and treat with copper-free parasite medications designed for crustaceans
Molting Problems
Difficulty shedding exoskeleton, incomplete molts, or death during molting process
Ensure adequate calcium and iodine through varied diet and supplements. Maintain stable water parameters and provide low-stress environment with plenty of hiding spots
Ammonia/Nitrite Poisoning
Lethargy, loss of appetite, discolored appearance, and sudden death
Perform immediate large water changes, test water parameters, and establish proper biological filtration. Avoid overstocking and overfeeding
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Quick Facts
- pH
- 8.1–8.4
- diet
- omnivore — detritus, meaty foods
- maxSize
- 2 inches
- minTankSize
- 10 gallons
- temperature
- 72–82°F (22–28°C)
Temperature
72–82°F
22–28°C