Tank Setup
- Tank size: 75 gallons minimum — yellow tangs are active swimmers that need horizontal swimming space. A 4-foot tank is the minimum length.
- Rock work: Lots of live rock for grazing. Yellow tangs spend most of their day picking algae off surfaces.
- Flow: Moderate to strong — mimics reef conditions
Water Parameters
- Temperature: 75–82°F
- pH: 8.1–8.4
- Salinity: 1.024–1.026 SG
- Ammonia/Nitrite: 0 ppm
- Nitrate: below 10 ppm
Diet & Feeding
Primarily herbivorous — algae should make up 80%+ of their diet:
- Staple: Nori sheets (dried seaweed) clipped to the tank glass or a veggie clip — offer daily
- Supplements: Marine algae pellets, spirulina flakes, frozen mysis shrimp
- Important: A diet lacking algae/vegetables leads to Head and Lateral Line Erosion (HLLE) — pitting around the head and lateral line. Ensure plenty of green food.
Aggression
Yellow tangs are peaceful toward most tank mates but highly aggressive toward:
- Other yellow tangs (unless in very large tanks — 150+ gallons)
- Similar-shaped fish (other tangs, angelfish) in smaller tanks
They have a sharp scalpel (tang) near the base of their tail fin that they use defensively. Handle with care — the tang can slice skin.
Pricing Note
Yellow tangs were once $30–$40 fish. Following the 2021 ban on aquarium fish collection in Hawaii (their primary source), captive-bred specimens now cost $200–$400+. Captive-bred yellow tangs from Biota and other breeders are available but limited.
Tank Mates
Compatible with most reef fish that are not tang-shaped: clownfish, wrasses, blennies, gobies, cardinalfish, hawkfish. Avoid other tangs in tanks under 125 gallons.
Frequently Asked Questions
Can I keep a yellow tang in a 55-gallon tank?
Not recommended. While they will survive, 55 gallons doesn't provide enough swimming space for a fish that grows to 8 inches and is naturally wide-ranging. 75 gallons (4-foot tank) is the minimum for long-term health.
Why is my yellow tang so expensive?
The 2021 Hawaii collection ban drastically reduced supply. Most yellow tangs now available are captive-bred, which is more costly but environmentally responsible.