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Blue Tang (Paracanthurus hepatus)

Blue Tang

Paracanthurus hepatus
Reef SafeAlgae GrazerGets LargeIch-Prone
Family
Tang / Surgeonfish
Care level
Intermediate
Temperament
Semi-aggressive
Reef safe
Reef safe
Max size
30 cm
Min tank
600 L · 159 gal
Origin
Indo-Pacific
Diet
Herbivore
Food
Nori, Marine algae, Spirulina, Herbivore pellets, Mysis
In stock — $95 →

Overview

The Blue Tang (Paracanthurus hepatus) — also known as the Palette Surgeonfish, Regal, Hepatus or Pacific Blue Tang — is one of the most recognisable fish in the ocean, and the famous 'Dory'. Its electric-blue body is splashed with a bold black palette pattern and finished with a vivid yellow tail — a genuine showstopper in any large reef.

Beyond the looks, it's an active, personable fish full of character, fully reef-safe, and a wonderful centrepiece. It does grow large and needs real swimming room and steady care, though, so it's best thought of as a fish for an experienced keeper with a big, established system.

We rate it intermediate for good reason: it's famously prone to ich, needs a genuinely spacious tank, and rewards attentive husbandry. Get those things right and it's a hardy, long-lived and spectacular reef fish.

Compatibility

The Blue Tang is a fast, constantly-moving fish that's generally peaceful toward unrelated tankmates but has a semi-aggressive streak toward its own kind and other tangs — especially those of similar shape or colour. As a rule, keep one Blue Tang per tank.

To house more than one, or to mix it with other tangs, add them all at the same time into a large, well-aquascaped system so no single fish can claim territory first; adding a tang to an established one usually ends badly. It mixes well with most peaceful-to-robust community fish that aren't surgeonfish — clownfish, wrasses, anthias, angels and the like. Take care with the sharp caudal scalpel when netting, and give it plenty of space to keep squabbling to a minimum.

Health & quarantine

This is where the Blue Tang earns its intermediate rating. It lacks a heavy body-slime coat and is famously susceptible to marine ich and other skin parasites, particularly through the stress of collection and introduction — so a proper quarantine period and a slow, patient acclimation are strongly recommended and dramatically improve long-term success. It's also prone to head-and-lateral-line erosion (HLLE) if diet or water quality slips. Keep it in a large, mature system with pristine, stable, well-oxygenated water and strong flow, support it with cleaner shrimp or wrasses, and feed a varied, algae-rich diet. Bought healthy, quarantined and well cared for, it's a robust fish that can live well over a decade.

Frequently asked questions

How big does the Blue Tang get, and what tank does it need?
It reaches around 30 cm and swims constantly, so it needs a large system — we'd treat roughly 600 litres on a five-foot-plus footprint as a sensible minimum, with bigger genuinely better. Long, open swimming space matters more than tank height. It's not a fish for a small or nano tank, despite how often small ones are sold.
Is it reef safe?
Yes. As a herbivore it won't harm corals or invertebrates and actually helps by grazing algae. Keep it well-fed with greens so it stays focused on algae rather than anything else.
Why is quarantine so important for Blue Tangs?
They're among the most ich-prone marine fish, and the stress of a new tank often triggers an outbreak. A proper quarantine period lets you observe, treat if needed, and get the fish feeding confidently before it joins your display — protecting both the tang and everything else in the tank.
Why does my Blue Tang wedge itself in the rocks or lie on its side?
That's completely normal. Blue Tangs squeeze into crevices to sleep and hide, and will sometimes lie flat or at odd angles when resting or startled. It looks alarming but it's natural behaviour — a healthy tang bounces straight back up and swims off.
Can I keep more than one?
Only with care. They're semi-aggressive toward their own kind and other tangs. In most tanks, one Blue Tang per system is safest; to keep several, use a very large tank and introduce them all together to spread out the aggression.
Is it a good beginner fish?
Not really. Between its adult size, big-tank requirement and strong tendency toward ich, it's better suited to a keeper with an established, spacious system and some experience under their belt. It's a stunning fish, but one to grow into rather than start with.

Care guidance is drawn from our own experience — every fish is an individual, so treat it as a starting point, not a guarantee. Not sure if a species suits your tank? Come ask us in store. New to the terms? Read the care-terms glossary.