Flame Fin Tomini Bristletooth Tang (Ctenochaetus tominiensis) saltwater aquarium fish

Overview:

The Flame Fin Tomini Bristletooth Tang is a hardy, active reef fish best kept in a mature marine aquarium with stable water quality and plenty of grazing surfaces. Although relatively smaller than many surgeonfish, it still needs room to swim, so a long tank with strong circulation and excellent oxygenation is ideal. Provide abundant live rock for natural browsing and sheltered sleeping/resting areas, along with open swimming space. A peaceful, established system with low nitrate and phosphate, consistent salinity, and strong biological filtration will help this tang thrive. Like other bristletooths, it benefits from a tank with natural algae growth and regular pruning of nuisance algae, rather than a sterile environment.

Diet and Feeding:

This species is primarily an herbivore with an emphasis on microalgae and film algae. In captivity, offer frequent small feedings of marine algae-based foods, such as dried nori, spirulina-based pellets, and herbivore frozen blends. Feeding several times per day in modest portions supports digestive health and reduces aggression. Supplement with chopped vegetable matter when appropriate, but avoid overly rich, fatty foods as a staple. The Flame Fin Tomini Bristletooth Tang does best when it can graze throughout the day, so keep algae clips available and allow access to natural forage on rock surfaces. A varied, vegetable-forward diet helps maintain color, condition, and long-term vitality.

Compatibility:

This tang is generally peaceful and more community-friendly than many larger tang species, but it can still become territorial toward similar body shapes or other tangs in smaller aquariums. It is usually compatible with clownfish, wrasses, gobies, blennies, dwarf angels, chromis, and most non-aggressive reef-safe fish. In mixed-tang setups, introduction order and tank size matter; adding it after more dominant species may reduce harassment, while cramped quarters increase conflict. It may show occasional assertiveness around feeding areas, so multiple food stations can help. It is typically reef safe and may even help control nuisance algae, but individual behavior varies, especially if the fish is underfed or housed in a sparse environment.

Health and Quarantine:

Common concerns include ich, marine velvet, stress-related weight loss, fin irritation, and head-and-lateral-line erosion if water quality or diet is poor. This species is sensitive to rapid changes in salinity, temperature, and pH, so acclimate slowly and maintain steady conditions. Quarantine is strongly recommended for new arrivals to observe appetite, breathing, and skin condition before introduction to the display tank. During quarantine, provide hiding places, pristine water, and a graze-friendly diet to encourage eating. Because tangs are prone to shipping stress and parasite exposure, early feeding and close observation are essential. Regular water changes, varied plant-based nutrition, and low-stress handling are the best preventive measures.

algae/nori spirulina mysis brine shrimp
The Flame Fin Tomini Bristletooth Tang is an active, nonstop swimmer that spends much of the day methodically browsing algae from rockwork, so it needs plenty of open water paired with ample live rock and a few retreat spaces. It is generally peaceful but can become territorial, especially toward conspecifics and similarly shaped tangs, so multiple specimens are best avoided unless the system is very large. A minimum tank size of 75 gallons is recommended, with 90 gallons or more preferred to reduce stress and allow natural grazing behavior. Aquascaping should include strong rockwork and visual barriers to break up lines of sight and limit territorial displays. This species is typically reef-safe and usually coexists well with most non-aggressive tank mates, including other peaceful reef fishes and invertebrates. As a herbivorous to detritivorous grazer, it primarily feeds on microalgae, film algae, and supplemental nori or other vegetable-based foods, with occasional detrital material also taken while foraging.

FAQ

Frequently Asked Questions

About the Flame Fin Tomini Bristletooth Tang

  • How can I tell a Flame Fin Tomini Bristletooth Tang apart from a Kole Tang or other bristletooth tangs at the store?
    The Flame Fin Tomini usually has a more compact, oval body, a pointed snout for grazing, and a more subdued brown-to-olive base color with a noticeably reddish-orange to “flame” tint in the dorsal and/or tail fin areas. Compared with a Kole Tang, it typically looks a bit slimmer and more angular in the head, and the fin coloration is the easiest giveaway. Like all Ctenochaetus, it has small brush-like teeth rather than the obvious “saw” profile people expect from tangs.
  • What tank size is actually appropriate for a Flame Fin Tomini Bristletooth Tang once it’s adult-sized?
    A true long-term setup should be at least 75 gallons, with 90+ gallons being better if you want stable grazing space and lower territorial pressure. They are not as large-bodied as Zebrasoma tangs, but they are active constant grazers and need plenty of rockwork surface area. They do best in a tank with open swimming lanes plus mature live rock for film algae and detritus grazing.
  • What should I feed a Flame Fin Tomini Bristletooth Tang if my tank doesn’t grow much algae?
    Don’t rely on tank algae alone. Feed a varied diet centered on marine algae and herbivore foods: nori, spirulina-based pellets, herbivore flakes, frozen foods with plant content, and occasional finely chopped meaty foods. They especially benefit from frequent small feedings because they naturally pick all day. If they start thinning in the belly, it usually means they need more grazing material and more frequent feeding.
  • Why is my Flame Fin Tomini Bristletooth Tang constantly picking at rocks and glass?
    That’s normal and actually one of the reasons bristletooth tangs are so valuable. They are detritivores and film-algae grazers, so they constantly scrape surfaces with their specialized teeth. This behavior is usually healthy unless they are also losing weight, breathing hard, or ignoring food. In a clean new tank with little natural growth, the constant picking can become stress behavior if supplemental feeding is not strong enough.
  • Are Flame Fin Tomini Bristletooth Tangs aggressive toward other tangs, and what tankmates work best?
    They are usually milder than many other tangs, but they can still be territorial with similar-shaped fish, especially other bristletooth tangs or fish introduced after they settle in. They tend to do best with peaceful-to-semi-aggressive community fish and can often coexist with other tangs in larger systems if added carefully and with enough space. Best tankmates are fish that won’t outcompete them for food or bully them, such as gobies, wrasses, anthias, clowns, and similarly sized reef-safe species.