Randall's Goby

Randall’s Goby (Amblyeleotris randalli), also known as Randall’s Prawn Goby or Randall’s Shrimp Goby, is a distinctive saltwater fish featuring a pearly white body crossed by narrow orange bands and a prominent black marking on its tall, fan-shaped first dorsal fin. Its bold patterning, watchful behavior, and fascinating relationship with burrowing pistol shrimp make it an especially engaging addition to a reef aquarium.

Native to the western Pacific, this species ranges from the Moluccas and Solomon Islands north to the Ryukyu Islands and south to the northern Great Barrier Reef, with populations also occurring around Palau. Randall’s Gobies naturally inhabit clear reef environments with sand, rubble, and small caves where they maintain burrows in association with snapping shrimp.

Peaceful toward most marine aquarium fish and generally easy to maintain once established, Randall’s Goby is an excellent choice for reef and peaceful fish-only aquariums. Its relatively sedentary lifestyle allows it to thrive without enormous swimming space, but a suitable sand bed, secure rockwork, and protected territory are important for long-term care.

Quick Care Guide

Care Level: Easy to Moderate
Minimum Tank Size: 30 gallons
Temperament: Peaceful
Diet: Carnivore
Reef Safe: Yes
Region: Western Pacific – Moluccas to Solomon Islands, Ryukyu Islands, Palau, and northern Great Barrier Reef
Scientific Name: Amblyeleotris randalli

Tank Requirements

Provide a mature marine aquarium with a sandy substrate and areas of small rubble around stable rockwork. Randall’s Goby naturally lives close to the bottom and benefits from caves, crevices, and protected areas where it can establish a burrow.

A substrate containing fine to moderately sized sand is ideal, particularly when the goby is maintained with a compatible pistol shrimp. Small pieces of coral rubble or shell fragments can provide useful building material for the shrimp as it maintains the shared burrow.

Rockwork should be positioned securely on the aquarium bottom rather than resting loosely on shifting sand. Burrowing activity can undermine unstable structures, so careful aquascaping is important.

Moderate water movement is appropriate, although excessively strong flow directly across the goby’s territory should be avoided. A secure mesh screen or aquarium lid is also recommended, as gobies may jump when startled or newly introduced.

Diet and Feeding

Randall’s Goby is a carnivore that naturally consumes small crustaceans, zooplankton, and other appropriately sized animal foods around its reef habitat.

In captivity, offer enriched mysis shrimp, enriched brine shrimp, copepods, finely chopped shrimp, frozen plankton blends, and other small meaty marine foods. Appropriately sized high-quality sinking pellets can also be incorporated once the fish readily accepts prepared diets.

Feed one to two times daily. Because this species often remains close to its burrow, make sure food reaches the bottom of the aquarium rather than being consumed entirely by faster midwater tankmates. Target feeding can be helpful in heavily stocked systems.

Temperament and Tankmates

Randall’s Goby is generally peaceful and compatible with a wide variety of reef-safe community fish. Suitable tankmates include clownfish, cardinalfish, firefish, peaceful wrasses, blennies, assessors, and other non-predatory marine species.

It may become territorial toward other shrimp gobies or similarly shaped bottom-dwelling fish, particularly if they compete for the same burrow or limited bottom territory. Providing multiple caves and sufficient separation can reduce these interactions.

A single specimen works well in most aquariums. Randall’s Goby can also develop a symbiotic partnership with an appropriate pistol shrimp. The shrimp excavates and maintains the burrow while the goby remains near the entrance and watches for potential danger, creating one of the most interesting natural partnerships available to reef aquarium keepers.

Reef Compatibility

Randall’s Goby is considered reef safe and does not normally consume or damage corals, clams, or other sessile reef organisms.

It is generally compatible with established ornamental shrimp, crabs, snails, and other common reef invertebrates. Tiny crustaceans and copepods may be consumed naturally, but larger ornamental invertebrates are not normally targeted.

Its excellent coral compatibility and bottom-oriented lifestyle make it particularly well suited to mixed reef aquariums.

Water Parameters

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

Maintain stable, well-oxygenated water with consistently good water quality. Stability is more important than targeting one exact value within these ranges, and sudden changes in temperature or salinity should be avoided.

Common Considerations

• Shrimp partnership: Can form a fascinating symbiotic relationship with a compatible burrowing pistol shrimp.

• Adult size: Can reach approximately 4.5–5 inches and should be provided with adequate bottom territory and shelter.

• Burrowing setup: A sand substrate with small rubble pieces and securely positioned rockwork is ideal.

• Territorial behavior: Generally peaceful but may defend its burrow from other shrimp gobies or similar bottom-dwelling fish.

• Jumping risk: A securely fitted mesh screen or aquarium lid is recommended, particularly during acclimation.