QUICK STATS

Care Level: Easy to Moderate
Diet: Omnivore / Herbivore-Leaning
Temperament: Peaceful
Reef-Safe: Yes
Venomous/Toxic: No
Approximate Purchase Size: 1-2"
Approximate Max Size: Around 2-3"
Recommended Tank Size: 20-30 Gallons or Larger

HECTOR’S GOBY

The Hector’s Goby (Koumansetta hectori), also known as Hector’s Hover Goby, is a small peaceful reef fish known for its dark body, bold yellow horizontal striping, and subtle hovering behavior over rockwork and substrate. It is sometimes still listed under the older name Amblygobius hectori, because apparently even tiny gobies need an alias.

Hector’s Gobies are excellent candidates for peaceful reef aquariums, especially mature systems with live rock, sand, and natural grazing surfaces. They spend much of their time picking at algae, biofilm, and tiny foods on rocks and substrate. They may also sift small amounts of sand while foraging, though they are usually not as disruptive as larger sleeper gobies.

This species is generally considered reef-safe and should not bother corals or common invertebrates. It can be useful for light algae grazing and sandbed foraging, but it should not be treated as a complete algae-control solution. It is a fish, not a tiny striped maintenance employee, despite the tempting fantasy.

Note: Image is a representation of what to expect. The fish you receive may vary slightly in size, color, markings, and overall appearance.

AQUARIUM REQUIREMENTS

AQUARIUM SIZE

A minimum tank size of 20 gallons or larger is recommended for a Hector’s Goby, though 30 gallons or larger is preferred for better stability, more grazing surfaces, and more room for tank mates.

While some care references list Hector’s Gobies as suitable for smaller nano aquariums, a slightly larger established system gives them more natural food availability and a more stable environment. Tiny fish still live in water chemistry, tragically.

HABITAT RECOMMENDATIONS

Hector’s Gobies do best in established reef aquariums with live rock, open substrate areas, and plenty of natural grazing surfaces.

Aquascaping: Provide live rock, caves, crevices, and open areas along the sandbed. These gobies often hover close to the rock and substrate while picking at tiny foods.

Substrate: Fine sand or soft aragonite is recommended. Hector’s Gobies may sift or pick through the substrate while foraging, so avoid sharp or overly coarse material.

Rockwork: Live rock is strongly recommended. It provides shelter, biological filtration, and natural grazing surfaces for algae and biofilm.

Tank Maturity: A mature aquarium is preferred. Established rockwork and substrate provide more natural microfauna, film algae, and biofilm for grazing.

Tank Cover: A tight-fitting lid is recommended. Gobies are known jumpers, because apparently remaining inside the safe glass box was too straightforward.

WATER PARAMETERS

Hector’s Gobies are generally hardy once established, but they still need clean, stable marine conditions. “Small and peaceful” does not mean “immune to unstable water,” though nano tanks continue trying to make that everyone’s problem.

Temperature: 72-78°F
pH Level: 8.1-8.4
Salinity: 1.020-1.026 specific gravity
Ammonia, Nitrite, and Nitrate: Ammonia and nitrite should remain undetectable. Nitrate should be kept as low as reasonably possible, ideally below 20 ppm.
Water Flow: Low to moderate flow is ideal. Provide enough movement to keep the aquarium oxygenated and move waste toward filtration, while still allowing calmer areas near the rockwork and sandbed for foraging.

DIET

Hector’s Gobies are omnivores with a herbivore-leaning diet. They naturally graze on filamentous algae, film algae, biofilm, and tiny organisms found on rockwork and substrate. In aquariums, they should be offered a varied diet and not expected to survive only on whatever they find in the tank.

PRIMARY DIET

Frozen Food: Offer mysis shrimp, enriched brine shrimp, cyclops, marine blends, and other small frozen foods. We at Summit City Coral prefer frozen foods such as LRS Herbivore Frenzy and PE Mysis.

Prepared Herbivore Foods: High-quality herbivore pellets, spirulina flakes, marine algae pellets, and small omnivore foods can help provide balanced nutrition.

Algae-Based Foods: Nori, spirulina, algae wafers, herbivore blends, and marine algae foods can be offered regularly, especially in very clean aquariums with limited natural grazing.

Natural Grazing: Established live rock with film algae, biofilm, and microfauna helps support natural feeding behavior. This should be viewed as supplemental, not the whole meal plan. Fish do not thrive on vibes and a few dusty patches of algae.

FEEDING FREQUENCY

Feed small amounts 1-2 times per day, or 2-3 times per day for new, shy, or thinner individuals. Make sure food is small enough for the goby to eat and reaches the lower parts of the aquarium before faster tank mates inhale everything like aquatic tax collectors.

COMPATIBILITY

Hector’s Gobies are peaceful and work best in calm community reef aquariums. They should be housed with tank mates that will not bully, chase, or severely outcompete them for food.

COMMON TANK MATES

Fish: Clownfish, cardinalfish, firefish, peaceful gobies, blennies, small peaceful wrasses, chromis, dwarf angelfish, and other calm community reef fish.

Avoid: Aggressive damsels, aggressive dottybacks, large predatory fish, aggressive wrasses, triggers, groupers, lionfish, and any fish likely to bully or eat them.

Same Species: May be kept singly or possibly as a pair in a suitable aquarium. Avoid crowding multiple similar gobies in small tanks unless there is enough territory, food, and hiding space.

Invertebrates: Safe with cleaner shrimp, hermit crabs, snails, urchins, and most common reef invertebrates.

Coral: Hector’s Gobies are considered reef-safe and should not bother soft corals, LPS, SPS, zoanthids, mushrooms, clams, or anemones. They may occasionally stir a small amount of sand while foraging, but they are usually not major sand-moving disasters like some larger sleeper gobies.

BEHAVIORAL NOTES

Temperament: Peaceful overall and usually calm with other reef fish.

Grazing Behavior: Picks at algae, biofilm, and tiny foods on rockwork and substrate throughout the day.

Sand Foraging: May sift or pick through sand lightly while feeding. Usually less disruptive than larger sand-sifting gobies.

Hovering Behavior: Often hovers close to the substrate or rockwork rather than perching heavily or swimming constantly in open water.

Reef Compatibility: Excellent for reef aquariums. Generally ignores corals and invertebrates.

Algae Control: Can help with light filamentous algae grazing, but should not be expected to solve a major algae outbreak alone. That is a nutrient issue, not a goby staffing shortage.

Feeding Risk: Very clean tanks may not provide enough natural grazing. Offer regular prepared, frozen, and algae-based foods.

Taxonomy Note: Hector’s Goby is commonly listed as Koumansetta hectori, though older names such as Amblygobius hectori may still appear in the aquarium trade.

Jumping: A tight-fitting lid is recommended. Small gobies can and will make catastrophic little launch decisions.

ACCLIMATION PROCESS

This acclimation method helps reduce stress by gradually introducing the fish to your aquarium’s temperature and water chemistry.

1. TURN OFF THE LIGHTS & ATO

Turn off aquarium lights to reduce stress. If you have an Auto Top Off system, switch it off before starting acclimation.

2. FLOAT THE BAG

Float the sealed bag in the aquarium for 15-20 minutes to allow the temperature in the bag to equalize with the tank.

3. OPEN BAG, ADD FISH TO CONTAINER

Carefully open the bag and transfer the fish and shipping water into a clean bucket or container.

4. ACCLIMATE USING TANK WATER

Add 1/4 cup of tank water to the container every 5 minutes for 40 minutes.

5. TRANSFER FISH TO AQUARIUM

Once acclimation is complete, gently transfer the fish into the aquarium using a net or specimen container. Discard the shipping water. Do not pour shipping water into your aquarium.

6. REFILL THE AQUARIUM WITH SALTWATER

You may need to replace the saltwater removed during acclimation with fresh mixed saltwater.