Tiger Pistol Shrimp

Pistol shrimps offer a look into the symbiotic relationship that exists between reef inhabitants in the wild. The tiger pistol shrimp (Alpheus bellulus) is one of the most common pistol species in the hobby, and also one of the largest. These beautiful white pistol shrimp can be identified by the orange-brown stripes running down the entirety of their otherwise white carapace and claws. Pistol shrimps are most well-known for their asymmetric claws, with the larger claw being capable of releasing high speed air bubbles, creating a close-ranged shockwave used to stun and kill prey as well as warn would-be predators and intruders; The shockwave created by these air bubbles is so loud it can and will likely be heard outside of the tank!

Despite their seemingly dangerous demeanor, Tiger pistol shrimp are capable of forming symbiotic relationships with a variety of commonly kept goby species, including Randall’s gobies, Yellow Watchman gobies, Yasha Hase gobies, and Spotted Prawn gobies to name a few. In this relationship, the shrimp (being blind) tends to the burrow while the goby acts as a lookout and brings food back to the den to share with its companion. When a pair is formed, the goby and pistol shrimp may scout out a variety of locations before building a new burrow. It is not uncommon to see your pistol shrimp or goby removing sand from their burrow as they expand their home, and caution should be taken to remove any corals that may be near the burrow to prevent them from becoming buried. Other than this, pistol shrimps are generally reef safe, but may become aggressive towards fishes that invade their territory.

Quick Care Guide

Care Level: Easy to Moderate
Minimum Tank Size: 20 gallons
Temperament: Peaceful toward most fish; territorial around its burrow
Diet: Carnivorous Scavenger
Reef Safe: Yes
Adult Size: Up to about 2 inches
Region: Indo-Pacific
Scientific Name: Alpheus bellulus

Tank Requirements

Provide a mature marine aquarium with a sand bed at least 2–3 inches deep. A mix of fine sand and small rubble gives the shrimp the material it needs to shore up tunnel walls, and flat pieces of rock placed on the sand make ideal burrow roofs.

Because Tiger Pistol Shrimp excavate beneath rockwork, the main rock structure should sit directly on the bottom glass or on stable supports before sand is added. Rock resting only on top of the sand can shift or collapse once tunneling begins.

Pairing with a Goby

A pairing is never guaranteed, but it is most likely when the shrimp and a compatible goby are introduced around the same time, or when the goby is added after the shrimp has established a burrow. Watchman gobies (Cryptocentrus), Yasha gobies, Randall’s gobies, and other shrimp gobies such as Amblyeleotris and Stonogobiops species are the most common partners.

Once paired, the shrimp keeps a feeler on the goby while it works, and the goby signals danger with a flick of its tail. A single pair per burrow is the norm; in larger aquariums, several pairs can coexist if each has its own territory.

Diet and Feeding

The Tiger Pistol Shrimp is an opportunistic carnivore. It accepts thawed mysis, enriched brine shrimp, finely chopped shrimp or clam, frozen carnivore blends, and sinking marine pellets. Leftovers that drift near the burrow are quickly pulled inside.

Target-feed small portions near the burrow entrance two to four times per week with tongs or a feeding tube, especially in busy community tanks where fish may take food before it reaches the sand. A paired goby will share food, but it should not be relied on as the shrimp’s only source of nutrition.

Temperament and Tankmates

Tiger Pistol Shrimp ignore most fish and corals, but they will defend their burrow from other bottom-dwelling shrimp and crabs. Keep only one shrimp per burrow unless you have a known mated pair.

Avoid predatory fish that eat ornamental shrimp, including triggerfish, puffers, hawkfish, lionfish, large wrasses, and dottybacks. Peaceful reef fish, gobies, blennies, clownfish, and tangs are generally safe companions.

Reef Compatibility

This species is reef safe and does not eat corals. The main risk is its digging: coral frags placed on the sand near a burrow can be buried or tipped over, so mount frags on rock or glue them in place.

Water Parameters

Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Drip acclimate slowly, since shrimp are sensitive to sudden changes in salinity and pH. Invertebrates are highly sensitive to copper, and copper-treated water or medications should never be added to an aquarium that houses them.

Common Considerations

• The snap is normal: The loud popping or clicking sound is how the shrimp communicates and defends itself. It is not a sign of stress.

• Secure your rockwork: Place rock on the bottom glass before adding sand so tunneling cannot undermine it.

• Expect it to hide at first: New shrimp often stay out of sight for several days while they dig and settle.

• Molting is natural: Shed exoskeletons can look like a dead shrimp. The shrimp will hide for a day or two while its new shell hardens.