Blue Hippo Tang - Yellow Belly

The Yellow Belly Hippo Tang is a color variant of the Blue Hippo Tang, Paracanthurus hepatus. A yellow wash covers the lower body and belly, contrasting with deep blue flanks and black palette markings.

In the wild, it inhabits seaward reefs and lagoons, often forming loose groups above branching corals and darting into cover when threatened. In an aquarium, it needs open swimming water, stable conditions, and rockwork for retreat. It can be kept in established reef or spacious fish-only systems.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 125 gallons
Temperament: Semi-Aggressive
Diet: Omnivore
Reef Safe: Yes
Region: Indo-Pacific
Scientific Name: Paracanthurus hepatus

Tank Requirements

Provide a long, unobstructed footprint that prioritizes horizontal swimming distance over height. It swims constantly, and cramped or narrow quarters can lead to stress and pacing.

Use strong water movement, high oxygenation, and excellent filtration. Arrange live rock with caves, clear sightlines, and multiple escape routes. A mature system with low nitrate and stable water quality is important. Use a tight-fitting lid because tangs may startle and jump when stressed.

Diet and Feeding

This tang grazes almost continuously on benthic and marine algae in the wild. Offer algae sheets or nori regularly, clipped to the glass or rockwork, with spirulina-based flakes or pellets as a staple.

Add mysis and brine shrimp a few times each week. Feed small portions two to four times daily instead of one large meal to support steady grazing and reduce underfeeding stress. Regular plant matter supports digestion and color and may help prevent head and lateral line erosion when paired with good water quality.

Temperament and Tankmates

Aggression is directed mainly toward its own kind and similarly shaped surgeonfish. With enough room, it generally coexists with dissimilar fish, including clownfish, gobies, wrasses, and many dwarf angelfish.

Keep one per aquarium unless the system can support multiple tangs selected and introduced carefully. Add it before more established or assertive tangs, and use rockwork to break up sightlines. Crowding and poor introduction order can lead to bullying and fin damage. Avoid aggressive triggers, large predatory fish, and tankmates that prevent it from feeding.

Reef Compatibility

It does not typically threaten corals or sessile invertebrates, concentrating its grazing on algae. It can also coexist with ornamental shrimp, snails, crabs, and other common reef inhabitants without notable predatory behavior.

Compatibility concerns are mainly with other fish, particularly similarly shaped tankmates that may trigger territorial behavior.

Water Parameters

Temperature: 72–78°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Keep these parameters stable and avoid rapid changes.

Common Considerations

• Adult size and swimming space: It reaches approximately 10 inches and remains an active swimmer, so a long footprint and generous open water are as important as total volume.
• Disease sensitivity: Hippo Tangs are notably prone to marine ich and velvet. Quarantine for 4 to 6 weeks before adding one to the display tank.
• Jumping risk: It may startle and jump when stressed, so keep the aquarium covered with a tight-fitting lid.
• Territorial behavior: Aggression is most likely toward other surgeonfish, especially similarly shaped or blue-bodied tangs. Manage it with ample space and careful introduction order.
• Nutrition and HLLE prevention: A varied diet rich in algae, together with excellent water quality, helps prevent head and lateral line erosion in poorly fed or stressed fish.