QUICK STATS

Care Level: Easy to Moderate
Diet: Herbivore / Omnivore
Temperament: Peaceful to Semi-Aggressive
Reef-Safe: Yes
Venomous/Toxic: No
Approximate Purchase Size: 2-4"
Approximate Max Size: Around 6"
Recommended Tank Size: 70-75 Gallons or Larger

TOMINI TANG

The Tomini Tang (Ctenochaetus tominiensis), also known as the Tomini Surgeonfish, Bristletooth Tomini Tang, or Flame Fin Tang, is a smaller tang species known for its brown to gray body, orange to yellow fin accents, and active grazing behavior. It may not be as loud visually as a Purple Tang or Sailfin Tang, but it brings useful algae grazing, constant movement, and a more manageable adult size than many other tangs.

Tomini Tangs belong to the bristletooth tang group, meaning they use specialized comb-like teeth to scrape film algae, detritus, and biofilm from rockwork and aquarium surfaces. Basically, they are tiny reef janitors with a tail scalpel and just enough attitude to remind everyone they are still tangs.

This species is considered reef-safe and should not bother corals or most invertebrates when properly fed. It is generally peaceful with many community fish but may become territorial toward other tangs, surgeonfish, or similarly shaped algae grazers. Smaller tang, yes. Emotionally mature? Let’s not get carried away.

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

AQUARIUM REQUIREMENTS

AQUARIUM SIZE

A minimum tank size of 70-75 gallons or larger is recommended for a Tomini Tang. This species stays smaller than many popular tangs, usually reaching around 6 inches, but it is still an active swimmer and should not be treated like a nano fish with branding issues.

Tank length and swimming room matter. A longer aquarium with open swimming lanes is better than a tall narrow tank pretending volume alone solves everything. Juvenile Tomini Tangs may look manageable at purchase size, but long-term care should still be planned around adult size, swimming behavior, and grazing needs.

HABITAT RECOMMENDATIONS

Tomini Tangs do best in mature aquariums with open swimming space, stable rockwork, strong filtration, and plenty of grazing surfaces.

Aquascaping: Provide open swimming room along with stable rock structures for grazing, shelter, and territory. Avoid overly cramped aquascapes that block swimming paths.

Substrate: Sand, fine aragonite, crushed coral, or bare-bottom systems can all work. This species does not depend heavily on the substrate.

Rockwork: Live rock is strongly recommended. It provides grazing surfaces, hiding places, territory, and biological filtration.

Tank Maturity: A mature aquarium is preferred, especially one with natural film algae, detritus, and biofilm growth. Tomini Tangs benefit from regular grazing opportunities throughout the day.

Tank Cover: A tight-fitting lid is recommended. Tangs are not the most famous jumpers, but large startled fish can still make athletic mistakes with expensive consequences.

WATER PARAMETERS

Tomini Tangs are generally hardy once established, but they still need clean, stable marine conditions. “Smaller tang” does not mean “immune to bad water,” though apparently the hobby keeps trying to negotiate with chemistry.

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: Moderate to strong water movement is ideal. Provide strong oxygenation, efficient filtration, and enough flow to move waste toward filtration while still allowing comfortable swimming space.

DIET

Tomini Tangs are primarily herbivorous to omnivorous grazers. As a bristletooth tang, they naturally scrape film algae, biofilm, detritus, and tiny food particles from hard surfaces. A diet rich in algae-based nutrition is important for maintaining body weight, color, digestion, and long-term health.

PRIMARY DIET

Frozen Food: Offer algae-rich frozen foods, mysis shrimp, enriched brine shrimp, marine blends, and other high-quality 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, marine algae pellets, spirulina flakes, and omnivore blends can help provide balanced nutrition.

Algae-Based Foods: Nori, seaweed sheets, spirulina, algae wafers, herbivore blends, and marine algae foods should be offered regularly. Clip seaweed sheets to the glass or rockwork so the tang can graze naturally.

Natural Grazing: Established live rock with film algae, biofilm, and detritus helps support natural feeding behavior. This should be viewed as supplemental, not the entire feeding plan. A Tomini Tang is not a free algae-control subscription with a tiny tail knife.

FEEDING FREQUENCY

Feed small amounts 1-2 times per day, with algae-based foods offered frequently. Tangs do best when they can graze throughout the day, so regular access to seaweed or algae-based foods is strongly recommended.

COMPATIBILITY

Tomini Tangs are generally peaceful to semi-aggressive and can work well in community reef aquariums with appropriate tank mates. They are usually calmer than some larger or more aggressive tangs, but they may still become territorial once established.

COMMON TANK MATES

Fish: Clownfish, cardinalfish, wrasses, gobies, blennies, rabbitfish, foxfaces, dwarf angelfish, larger peaceful fish, and other community reef fish.

Avoid: Other tangs or surgeonfish in smaller aquariums unless the tank is large enough and introductions are carefully managed. Avoid very timid fish that may be outcompeted and overly aggressive fish that may constantly harass the tang.

Other Tangs: Use caution when mixing with other tangs. Tomini Tangs may show aggression toward other surgeonfish, especially similarly shaped grazers or other bristletooth tangs. Larger aquariums, careful introduction, and plenty of territory help reduce conflict.

Invertebrates: Usually safe with cleaner shrimp, hermit crabs, snails, urchins, and common cleanup crew animals.

Coral: Tomini Tangs are considered reef-safe and should not bother soft corals, LPS, SPS, zoanthids, mushrooms, clams, or anemones when well-fed. Like many herbivores, underfed individuals may become more likely to investigate surfaces they should leave alone, because hunger remains a terrible consultant.

BEHAVIORAL NOTES

Temperament: Peaceful to semi-aggressive. Usually manageable in properly sized aquariums, but may become territorial once established.

Bristletooth Grazing: Uses specialized teeth to scrape film algae, biofilm, and detritus from rockwork and aquarium surfaces.

Algae Grazing: Helpful for film algae and soft algae growth. Still requires regular feeding and should not be used as the entire algae-control plan.

Reef Compatibility: Excellent for reef tanks when properly fed. They generally ignore corals and most invertebrates.

Swimming Style: Active swimmer that needs open swimming paths and should not be cramped into undersized aquariums.

Tang Scalpel: Like other surgeonfish, Tomini Tangs have a sharp scalpel-like spine near the tail used for defense. Use caution when catching, transferring, or working around the fish. It is not venomous, just equipped with a tiny biological box cutter, because fish apparently needed hardware.

Territoriality: May show aggression toward other tangs or similarly shaped fish, especially after becoming established.

Coloration: Typically shows a brown to gray body with orange, yellow, blue, or white highlights along the fins and tail. Color intensity may vary depending on stress, diet, maturity, lighting, and overall health.

Hardiness: Often considered one of the more manageable tangs due to its smaller adult size, but it still needs stable water quality, strong nutrition, and proper swimming space.

Disease Susceptibility: Like many tangs, Tomini Tangs can be prone to external parasites when stressed. Quarantine, observation, strong nutrition, and stable water quality are strongly recommended.

Tank Size Reality: This is one of the smaller tangs, but it is still an active surgeonfish. “Smaller tang” does not mean “small tank fish,” because apparently words are not legally binding in aquariums.

Jumping: A tight-fitting lid is recommended. Large fish can still make sudden, athletic mistakes.

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. Use caution near the tail spine when handling tangs. 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.