Kole Tang

Ctenochaetus strigosus

The bristletooth "cleaner" tang — mows film algae and detritus, and fits a mid-size reef.

Difficulty: IntermediateTang / surgeonfishReef-safe

The kole tang (Ctenochaetus strigosus) — the yellow-eye or bristletooth tang — is the reef's workhorse "cleaner" tang. Instead of the scissor-teeth of other tangs, it has comb-like bristle teeth it uses to rasp film algae, diatoms and detritus off the rock all day. That makes it gentler on prized macroalgae, genuinely useful, and one of the best tangs for a mid-sized reef.

Good to know: 70+ gal; one tang per tank; a detritus/diatom grazer that's gentler on macroalgae than other tangs.

📊 What keepers actually ask: Recommended as the best "smaller-tank" and most useful reef tang; the recurring question is "smallest tank for a tang?" — the kole is often the answer at 70+ gal.

Care at a glance

Adult size	~5–7 in.
Minimum tank	70+ gallons with open swimming length and lots of live rock (100+ is better long-term).
Temperature	75–82°F (24–28°C).
pH	8.1–8.4.
Specific gravity	1.023–1.026 (reef-standard ≈35 ppt).
Diet	Herbivore/detritivore — rasps film algae, diatoms and detritus off rock with its bristle teeth; supplement with nori and prepared herbivore foods.
Temperament	One of the more peaceful tangs toward non-tangs, but still territorial toward other tangs/surgeonfish — one tang per tank. Scalpel-sharp tail spine.
Reef-safe	Yes — it grazes algae and detritus, not corals (and, being a bristletooth, it's less likely to nibble prized macroalgae than the Zebrasoma tangs).
Natural range	Indo-Pacific / Hawaii.

Beginner-friendly, done right. The most "reef-useful" tang and a great choice for a mid-sized reef — it does real work grazing film algae and detritus, and it fits tanks (70+ gal) too small for a Zebrasoma or Acanthurus. Standard tang rules apply: one tang per tank (they're territorial toward other tangs), a big swimming footprint, and a scalpel-sharp spine at the tail base — handle with care. Tangs are an ich-prone family, so quarantine before adding.

Planning your stock list? Before you buy, run your tank and wish-list through our free stocking & tank-size calculator — it checks this fish's minimum tank and shoal size and flags any aggression clash, so you don't overstock.

The fish store gets these wrong

Common myths, kindly corrected — no shame for having believed them.

"All tangs need a huge tank." The kole is one of the more modest — 70+ gallons suits it, versus 90–180 for the bigger tangs. It's still not a nano fish, though.
"Tangs eat all my algae, including the good stuff." The kole's bristle teeth target film algae and detritus, so it's gentler on prized macroalgae than the scissor-toothed tangs.

Before you buy

A 70+ gallon tank with swimming length and lots of rock.
Only one tang per tank; quarantine before adding (tangs are ich-prone).
Nori/herbivore foods to supplement its grazing.

Quarantine and get help if…

We can't diagnose from a photo — but these are the signs to stop watching, quarantine, and get an aquatic vet or an experienced reefer's eyes on it:

White spots (ich) — tangs are especially prone; quarantine and treat at the first sign.
Rapid breathing, flashing, or a darkening/blotchy stress colour — a parasite or water-quality problem.
Not eating, thinning, or hiding — stress, bullying or illness.

Never

Never keep two tangs in a normal tank (add together only in a large one).
Never skip quarantine — tangs catch ich readily.
Never handle it bare-handed near the tail — the spine cuts.

Common kole tang questions

What's the smallest tank for a kole tang?

Around 70 gallons with open swimming length — the kole is one of the more modest tangs, but it's still an active swimmer and not a nano fish. 100 gallons or more is better long-term.

Is the kole tang reef-safe?

Yes — it grazes film algae, diatoms and detritus off the rock rather than eating corals, and its bristle teeth make it gentler on prized macroalgae than the scissor-toothed tangs.

Is the kole tang a good algae eater?

One of the best "cleaner" tangs — it works film algae, diatoms and detritus tirelessly. It's less effective on long hair algae than a Zebrasoma, but far better on the film and detritus that coat rock and glass.

Can I keep a kole tang with another tang?

Only in a large tank, and ideally added at the same time — tangs are territorial toward other tangs and surgeonfish. In a normal-sized tank, keep one tang.

Do kole tangs get ich?

Yes — like all tangs they're prone to marine ich, so quarantine before adding, keep water stable, and act fast at the first white spots. A well-fed kole in a stable tank is fairly hardy for a tang.

Sources & further reading

This guide was written and fact-checked against these authorities. It's honest, general guidance — not a diagnosis, and not a substitute for an aquatic vet or your own test kit:

Saltwater Aquarium Blog — Kole Tang — tank, diet, temperament
Reef Builders — The Kole Tang — bristletooth grazing, medium-tank tang
Fishlore — Kole Tang Care — size, tank, reef-safe

Written and fact-checked by The Coralkin Team against marine-aquarist and veterinary sources — if your kole tang shows a red-flag sign above, quarantine and get an aquatic vet or an experienced reefer's eyes on it. We never guess a care number.

🔬 Review status: team-written and fact-checked against cited sources · not yet reviewed by a marine vet. How we research & fact-check →

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