Blue Hippo Tang - Paracanthurus hepatus

Tiny (<1.25")

$79.99

Reef Safe Tang

$79.99

Size Tiny (<1.25") Small (1.25-2") SM (2-2.5") Medium (2.5-3.5") ML (3.5-4.25") Large (4.25-5.25")

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Goes well with:

Diet

algae/nori spirulina mysis brine shrimp

Min Tank Size 180 gallons

Temperament Semi-aggressive

Reef Safe Yes

Care & Diet Feeding, nutrition, and best practices.

Diet Type: Omnivore

Diet and Feeding: Blue Hippo Tangs are primarily herbivorous, grazing on marine algae, film algae, and detritus in the wild, and it is beneficial to replicate this with a diet built around nori, dried seaweed, spirulina-based flakes, and high-quality herbivore pellets as the main staples. To ensure balanced nutrition, supplement regularly with small portions of mysis shrimp, brine shrimp, chopped seafood, and algae-enriched frozen foods as occasional treats. Offer seaweed on a clip or feeding station and rotate staple foods to encourage natural foraging behavior and steady grazing throughout the day. Feed small amounts multiple times daily, and be careful to prevent overfeeding, as this helps maintain water quality and supports long-term health.

algae/nori spirulina mysis brine shrimp

Behavior Temperament, activity level, and interactions.

Temperament: Semi-aggressive

Blue Hippo Tangs are highly active, open-water cruisers that need ample uninterrupted swimming space along with plenty of rockwork and caves for shelter and nighttime security. They are generally peaceful toward most tank mates but can be assertive with conspecifics and other tangs, especially in confined quarters, so careful stocking and introduction order matter. A minimum tank size of 180 gallons is recommended, with a long layout that provides visual barriers, swim lanes, and structured rockwork to reduce stress and territorial tension. In reef aquariums they are typically reef-safe and coexist well with other non-aggressive community species, though they may become stressed around overly boisterous or similarly shaped fish. Their diet is primarily herbivorous, focused on filamentous algae and marine plant matter, and they benefit from regular feedings of algae-based preparations such as nori, spirulina, and herbivore pellets. Occasional meaty foods may be accepted, but their long-term health depends on consistent grazing opportunities and a varied, vegetable-rich regimen.

Tank & Aquascape Tank requirements and aquascaping tips.

Min Tank Size: 180 gallons
Max Size: 12 inches
Care Level: Moderate
Origin: Indo-Pacific

Compatibility Tank mates, aggression, and introduction order.

Temperament: Semi-aggressive
Reef Safe: Yes

Reef & Health Reef safety, common issues, and prevention.

Reef Safe: Yes
Care Level: Moderate

FAQs Answers to the most common questions.

Why does my Blue Hippo Tang (Paracanthurus hepatus) keep getting ich or velvet even in a “clean” reef tank?

Blue Hippo Tangs are one of the most parasite-prone tangs in the hobby because they stress easily during capture, shipping, and acclimation, and that stress can trigger marine ich or velvet. Even when water quality looks perfect, this species often arrives with a compromised mucus coat and a suppressed immune system. The best prevention is quarantine before the fish ever enters the display, with close observation for at least 30 days and proactive treatment if needed. A healthy Blue Hippo Tang should be eating aggressively and swimming normally; if it starts flashing, breathing fast, or hiding, act quickly because velvet can move very fast on this species.

How big of a tank does a Blue Hippo Tang really need, since many stores sell juveniles?

Juvenile Blue Hippo Tangs are often sold very small, but they grow into active, open-water swimmers that need a much larger system than their juvenile size suggests. A long tank is far more important than a tall tank because they are constant cruisers. For long-term care, a minimum of 6 feet of swimming length is strongly preferred, with larger being better as the fish matures. In undersized tanks, they commonly become stressed, pace the glass, or develop head-and-lateral-line erosion from chronic confinement and poor environmental quality.

Why does my Blue Hippo Tang go from electric blue to a dark, almost gray color?

Blue Hippo Tangs can dramatically darken when stressed, sleeping, or feeling threatened. This color change is often a normal stress response, especially after lights out, during transport, or when a dominant tankmate is harassing them. If the darkening is paired with clamped fins, rapid breathing, or refusal to eat, it usually means the fish is not settled. A healthy specimen will usually return to its vivid blue with yellow tail and dark markings once it feels secure, is feeding consistently, and has enough swimming space and hiding spots.

What foods do Blue Hippo Tangs need to keep them healthy and prevent head and lateral line erosion?

Blue Hippo Tangs are primarily herbivores/omnivores that do best on frequent, varied feedings with a strong algae component. The core diet should include marine algae sheets, quality algae-based pellets, and frozen foods with greens mixed in. They also appreciate small amounts of meaty foods like mysis, but plant matter should remain the foundation. To help reduce the risk of head and lateral line erosion, keep the diet rich in vitamins and avoid relying on only one food type. Also, strong water quality, low stress, and stable minerals are just as important as diet for preventing HLLE in this species.

Can a Blue Hippo Tang live peacefully with other tangs, especially in a reef tank?

Blue Hippo Tangs can coexist with other tangs, but only when the tank is large enough and the introduction order is managed carefully. They are generally not the most aggressive tang, but they can become territorial if crowded or introduced into an established tang hierarchy. In smaller tanks, they may get bullied by more dominant species like Sohal, Powder Blue, or Achilles tangs. In a reef tank, they are usually safe with corals, but the key is giving them enough space, multiple feeding stations, and enough rockwork to break sight lines so they don’t feel trapped or forced into constant conflict.

You will receive a fish SIMILAR in design and size to the fish in the photo. This is NOT a WYSIWYG fish.

Blue Hippo Tang – Paracanthurus hepatus

The Blue Hippo Tang is an iconic saltwater fish recognized by its electric-blue body, sweeping black palette-shaped pattern, and brilliant yellow tail. Also sold as the Regal Blue Tang, Palette Surgeonfish, or Pacific Blue Tang, its intense coloration and active swimming style make it a standout addition to a large marine aquarium.

Native to the Indo-Pacific, Paracanthurus hepatus ranges from East Africa and the Mascarene Islands east to Kiribati, north to southern Japan, and south to the Great Barrier Reef, New Caledonia, and Samoa. It inhabits clear, current-swept outer reefs and channels, where juveniles often shelter among branching corals and adults swim above the reef in loose groups. The species can reach approximately 12 inches in total length.

Its bold appearance, constant movement, and dependable coral compatibility make this species desirable for spacious reef aquariums and fish-only aquariums. Long-term care requires extensive swimming room, strong oxygenation, a varied diet, and careful management of territorial behavior around other surgeonfish.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 180 gallons
Temperament: Semi-aggressive
Diet: Omnivore / Planktivore
Reef Safe: Yes
Region: Indo-Pacific
Scientific Name: Paracanthurus hepatus

Tank Requirements

Provide a mature aquarium with a long swimming footprint and broad, unobstructed lanes through the center and front of the display. Position live rock mainly along the back and sides, creating caves, overhangs, and secure crevices without crowding the open water. Stable rockwork is important because this tang may wedge itself tightly into shelter when alarmed.

Moderate to strong, varied water movement, excellent oxygenation, efficient filtration, and consistent water quality are essential for this active outer-reef species. A specialized substrate is not required, although reef sand or fine gravel works well. A fitted lid or secure mesh cover is recommended, particularly during acclimation or when territorial disputes occur.

The aquarium should provide permanent adult-sized housing rather than temporary grow-out space. Water volume alone is not enough; horizontal swimming length and open turning space are equally important for a fish capable of exceeding 12 inches.

Diet and Feeding

The Blue Hippo Tang is best described as an omnivorous planktivore. Wild individuals feed heavily on zooplankton while also consuming algae, so a complete captive diet should include both marine proteins and vegetable-based foods rather than relying on algae alone.

Offer mysis shrimp, enriched brine shrimp, copepods, finely chopped shrimp or clam, frozen marine blends, and high-quality omnivore pellets. Supplement these foods with nori or other marine algae sheets, spirulina-based flakes, herbivore pellets, and frozen algae preparations.

Feed two to three small meals daily and provide algae sheets regularly for additional grazing. Multiple feeding stations can reduce competition when the tang is housed with rabbitfish, angelfish, or other active feeders.

Temperament and Tankmates

This species is generally peaceful toward unrelated marine fish but may become territorial with other tangs, especially similarly shaped surgeonfish competing for the same swimming and feeding areas. Aggression can increase as the fish matures and becomes established.

Suitable tankmates include clownfish, larger gobies, wrasses, rabbitfish, angelfish, butterflyfish, and other non-predatory community species. Avoid combining it with highly aggressive fish that may cause persistent stress or prevent it from feeding.

Keep one Blue Hippo Tang in most home aquariums. Multiple specimens or mixed tang communities should be attempted only in exceptionally large systems with separate territories, abundant food, and carefully planned introductions. Introduce more peaceful fish before established or territorial surgeonfish whenever possible.

Reef Compatibility

The Blue Hippo Tang is considered reef safe. It does not normally consume healthy stony corals, soft corals, zoanthids, clams, ornamental shrimp, crabs, snails, or other desirable reef inhabitants.

Natural grazing is generally directed toward algae growing on rockwork and other hard surfaces. Decorative macroalgae may be eaten, and a large adult can accidentally shift loosely mounted coral fragments while swimming or entering a shelter. Secure frags and leave adequate clearance around major swimming routes.

Water Parameters

Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Maintain strong oxygenation, consistent salinity, and low levels of accumulated waste. Stability is more important than repeatedly adjusting the aquarium to achieve one exact reading.

Common Considerations

Large adult size: This species can reach approximately 12 inches and requires a long, spacious aquarium.
Needs open swimming room: Dense rockwork should not restrict the main swimming lanes.
Use caution with other tangs: Territorial behavior is most likely toward similarly shaped surgeonfish.
Provide a mixed diet: Natural feeding includes substantial zooplankton as well as algae.
Handle carefully: Surgeonfish possess sharp defensive spines, and this species’ fin spines have been reported as mildly venomous. While not deadly, care should be taken to avoid painful cuts.