Mustard Guttatus Tang
Mustard Guttatus Tang
Goes well with:
FAQs Answers to the most common questions.
Is a Mustard Guttatus Tang the same as Acanthurus guttatus, and what should I expect from its adult size and shape?
Yes—hobbyists usually mean Acanthurus guttatus, commonly called the Whitespotted Tang or sometimes a “mustard” variant due to its yellowish body tone. Expect a deep-bodied, laterally compressed surgeonfish that gets fairly large, commonly around 8–10 inches as an adult, with juveniles looking much smaller and more patterned. It is an active swimmer and needs long horizontal swimming space more than just height.
What tank size and aquascape does a Mustard Guttatus Tang need to stay healthy and reduce aggression?
For a single adult, I’d treat 125 gallons as a bare minimum, with 180 gallons or larger being much better long term. They need strong flow, high oxygenation, and open swimming lanes with substantial rockwork for grazing and retreat. Use porous live rock with established algae growth, but avoid making the tank so packed that it blocks cruising space. They can be territorial, especially toward other tangs and similarly shaped fish.
What should I feed a Mustard Guttatus Tang, and how often should it be fed to prevent HLLE or weight loss?
This tang should get a diet built around marine algae and high-quality herbivore foods: nori, spirulina-based pellets, frozen herbivore blends, and occasional mysis or other meaty foods in small amounts. Feed at least 2–3 times daily if possible, especially for juveniles and newly imported fish. Consistent vegetable matter is important for body condition and gut health, and a varied diet helps reduce nutritional problems like HLLE.
How aggressive is a Mustard Guttatus Tang, and can it be kept with other tangs or surgeonfish?
It can be moderately to very aggressive, especially as it matures or if kept in a smaller tank. It usually does best as the only tang unless the system is large and the introduction strategy is carefully managed. In bigger tanks, it may coexist with tangs from different body shapes or colors, but pairing it with similar Acanthurus species can trigger chasing and territorial disputes. Adding it last is usually a bad idea if it’s the most territorial fish in the tank.
What are the most common health issues in Mustard Guttatus Tangs, and how do I acclimate one safely from collection stress?
The biggest issues are shipping stress, ich/other parasites, fin fraying from aggression, starvation in new imports, and lateral line erosion/HLLE if the diet or water quality is poor. They often arrive thin and need immediate access to algae-rich foods. Acclimate them slowly, keep salinity and temperature stable, and put them into a mature tank with strong oxygenation and low stress. A quarantine period with observation is strongly recommended because tangs are parasite-prone and can crash quickly if weakened.
Introduction to Saltwater Tangs
Tangs, also known as Surgeonfish, are active, fast-swimming herbivores known for their bold coloration, streamlined bodies, and role in controlling algae growth. Found in coral reefs worldwide, tangs require large aquariums with strong water flow to accommodate their constant movement and grazing habits. While peaceful toward most tankmates, tangs can be territorial and aggressive toward other tangs, particularly those of the same genus. They are best suited for well-established reef tanks with ample swimming space and hiding spots.
Care Requirements
Care Level: Moderate – Requires large tank Minimum Tank Size: 75 – 180+ gallons Smaller species (e.g., Kole Tang) – 75+ gallons Larger species (e.g., Achilles Tang, Blue Hippo Tang) – 125-180+ gallons Aquarium Setup: Requires open swimming areas, rockwork for hiding, and high water flow Tangs are strong swimmers that thrive in environments with high oxygen levels and strong filtration. They are prone to stress-related illnesses like Ich, making stable water parameters essential.
Diet & Nutrition
Tangs are herbivores that require a diet rich in plant-based foods for optimal health and vibrant coloration. Diet: Herbivorous – Prefers marine algae, seaweed, and plant-based foods
Recommended Foods:
Nori and seaweed sheets (offered daily) Spirulina-based flakes and pellets Blanched vegetables like zucchini and spinach Occasional protein-based foods like mysis shrimp for variety A nutrient-rich diet prevents nutritional deficiencies and lateral line erosion (HLLE), a common issue in tangs.
Lifespan & Growth Rate
Lifespan: 8-20+ years Growth Rate: Moderate to Fast – Many species reach 8-12 inches Tangs require long-term care and proper nutrition to reach their full lifespan and size.
Temperament & Compatibility
Temperament: Semi-Aggressive – Generally peaceful but territorial toward other tangs Reef Safe? Yes – Does not harm corals or invertebrates Tangs do well in reef aquariums and community tanks with: Clownfish Wrasses Angelfish Large gobies They may become aggressive toward other tangs, especially those with similar body shapes or coloration. Introducing multiple tangs at once in a large tank can help reduce aggression.
Common Challenges & Considerations
Prone to Marine Ich: Tangs are susceptible to Ich and other parasites, so quarantine before introducing to display tanks. Territorial Behavior: Can be aggressive toward new tangs, requiring careful introduction. Water Conditions Temperature: 74-80°F dKH (Alkalinity): 8-12 pH: 8.1-8.4 Specific Gravity: 1.020-1.025 Tangs thrive in high-quality reef conditions with strong filtration to support their active swimming habits.
Color Varieties & Popular Species
Tangs come in a wide range of colors and patterns, making them one of the most visually striking fish families in the hobby. Yellow Tang (Zebrasoma flavescens) – Bright yellow body, one of the most popular reef fish Blue Hippo Tang (Paracanthurus hepatus) – Electric blue body with black markings, also known as the "Dory" fish Kole Tang (Ctenochaetus strigosus) – Brownish body with blue highlights, a fantastic algae grazer Achilles Tang (Acanthurus achilles) – Black body with orange crescent tail, one of the most challenging tangs to keep
