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Blue Tang

By The Aquarium Calculators Editorial Team ·

Paracanthurus hepatus

Complete Blue Tang care guide covering herbivore diet requirements, semi-aggressive temperament, minimum 180 Gallons tank setup, and compatible saltwater tankmates. Difficulty: Advanced.

Blue Tang

Quick Answer

Blue Tang (Paracanthurus hepatus) is a stunning surgeonfish made famous by the movie Finding Nemo. It requires a minimum 180 Gallons aquarium with a pH of 8.1 - 8.4 and temperature range of 24-26°C. As a herbivore with semi-aggressive tendencies, careful tankmate selection is essential.

Intro

Blue Tang (Paracanthurus hepatus) is a stunning surgeonfish made famous by the movie Finding Nemo. It requires a large tank and pristine water conditions.

Setup

A 180-gallon or larger tank (6+ feet long) with plenty of swimming space and live rock. Strong water flow and excellent filtration (protein skimmer).

Feeding

Herbivorous; needs algae-based foods: nori sheets, spirulina flakes, marine pellets, and occasional mysis. Feed 2-3 times daily to prevent lateral line erosion.

Compatibility

Semi-aggressive. Keep singly or in small groups introduced simultaneously. Tankmates must be peaceful to moderately aggressive: clownfish, angelfish, tangs (with caution).

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Tank Position
Middle
Water Temp
24-26°C
Adult Size
See profile
Water pH
8.1 - 8.4

Species Characteristics

Adult Size
Lifespan
Growth Rate
moderate
Tank Compatibility
Community compatible
Indoor Aquarium
Yes

Water Parameters

Water Temperature
Humidity
Water pH

Tank Lighting

Tank Lighting
Standard lighting
Light Hours
N/A
Intensity
moderate

Feeding & Diet

Diet Type
Diet: Herbivore
Feeding Schedule
N/A
Live Food Options
N/A

Continue Learning

Recommended Tools

Fish Compatibility Calculator fish compatibility

Health & Disease

Ich (White Spot Disease) common disease • all fish

Related Guides

Understanding pH in Aquariums water parameters • ph

Similar Species

Mandarin Dragonet Care Guide: Reef Compatibility semanticSimilarity African Butterflyfish Care Guide: Tank Size & Diet semanticSimilarity African Cichlid Care Guide: Tank Size & Tank Mates semanticSimilarity

Frequently Asked Questions

How many Blue Tangs can be kept together?
Keep strictly one per aquarium unless the tank exceeds 180 gallons (680 liters) with a footprint of 84x24 inches (210x60 cm). Blue tangs (Paracanthurus hepatus) are highly territorial toward conspecifics and other tangs of the same genus. Two individuals in under 150 gallons (568 liters) will fight to severe injury, including lateral line erosion and torn fins. For multiple tangs, introduce 3-5 juveniles simultaneously in a 200+ gallon tank with ample rockwork. Provide at least 6 feet (180 cm) of linear swimming space. A single adult requires minimum 125 gallons (473 liters).
What are the exact water parameters for Blue Tangs?
Target pH 8.1 - 8.4, specific gravity 1.023 - 1.025, General Hardness 7 - 12 dGH, Carbonate Hardness 8 - 12 dKH, Total Dissolved Solids 32,000 - 35,000 ppm, and temperature 72°F - 78°F (22°C - 26°C). They are extremely sensitive to nitrates; maintain below 5 ppm with weekly 20% water changes. Use a high-protein skimmer and refugium with chaeto algae. Strong water flow (20x turnover) is mandatory to prevent skin infections. Provide UV sterilizer (25 watts per 100 gallons) to control marine ich. Ammonia must be 0 ppm; any detectable ammonia causes rapid deterioration.
What is the dietary and medication protocol for Blue Tangs?
They are omnivores with a heavy reliance on marine algae (70% vegetable, 30% protein). Feed dried nori sheets pinned to an algae clip daily (1 sheet per fish). Supplement with spirulina pellets, herbivore flakes, mysis shrimp, and finely chopped krill. Offer garlic-soaked foods to boost immunity. Medication alert: Extremely sensitive to copper (use Cupramine at 0.15 mg/L max) and hyposalinity (below 1.017 causes stress). Praziquantel is safe for flukes. Quarantine with chloroquine phosphate (15 mg/L) for 21 days. Avoid formalin and high-dose malachite green.
How to breed Blue Tangs in captivity?
Breeding is exceptionally rare and requires large-scale systems (500+ gallons / 1900 liters). Commercial breeders use hormone induction. To attempt, condition a group of 5+ adults in a 300+ gallon circular tank with strong current and live foods (copepods, mysis) for 6 months. Simulate lunar cycle: dim lights during new moon, increase to 14-hour photoperiod during full moon. Spawning occurs at dusk; female releases 10,000-40,000 pelagic eggs. Eggs hatch in 24 hours. Larvae require specialized rotifer and copepod feeding for 60-70 days before metamorphosis. Not feasible for home aquariums.

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