Mustard Guttatus Tang – Whitespotted Surgeonfish
The Mustard Guttatus Tang, also known as the Whitespotted Surgeonfish, occurs in large schools on the reef. The body of the fish is gray with two silver stripes towards the front half, and the back half is dotted with many white spots. The tail and the pelvic fins are a striking yellow that offsets the gray color of the fish.
A 250 gallon aquarium or larger is necessary to provide plenty of swimming room for the Mustard Guttatus Tang. An aquarium decorated with large amounts of live rock is ideal for both grazing and for hiding places. It is aggressive towards other Tangs and Surgeonfish, but peaceful with other fish.
Although Tangs will eat meaty foods along with the other fish in the aquarium, it is important that they are offered plenty of marine based seaweed and algae.
| Key Features |
|---|
| Body color: Gray with silver stripes and white spots |
| Tail and pelvic fins: Yellow |
| Aggression level: Aggressive toward other Tangs and Surgeonfish |
| Water requirements: 250 gallons or larger |
| Feeding: Requires marine seaweed and algae |
FAQ
What is the ideal tank size for a Mustard Guttatus Tang?
A 250 gallon aquarium or larger is necessary to provide enough swimming space.
Is the Mustard Guttatus Tang compatible with other fish?
It is peaceful with most fish but aggressive toward other Tangs and Surgeonfish.
What type of food should I feed my Mustard Guttatus Tang?
It should be offered marine-based seaweed and algae in addition to meaty foods.

Julian MacLeod –
The fish is active and colorful, adding a lot of visual interest to the tank. I provide plenty of algae and it eats regularly. Just make sure not to keep it with other Tangs or Surgeonfish.
Jessica Coleman –
Beautiful fish with distinct markings. Needs a large tank and a lot of live rock for hiding. Feeds well on algae wafers and spirulina.
Sebastian Terry –
Great addition to a reef tank. The yellow tail stands out well. I’ve had it for six months and it’s still healthy and active.
Gordon Dickens –
It’s a striking fish, but I had to separate it from another Tang immediately after introduction. Aggressive behavior is noticeable.