Powder Blue Tang

The Powder Blue Tang (Acanthurus leucosternon) is a constant rockwork grazer that helps with algae control while adding bold blue, yellow, black, and white contrast to a reef display. Expect a bright blue body with a dark face mask, a clean white chest area, and a yellow dorsal fin margin that stands out under reef lighting.

What You’ll Observe:

• Long, steady laps through open water with regular “patrol” loops around the rockwork
• Frequent stop-and-go grazing, pecking at film and naturally growing algae on surfaces
• A consistent evening routine where it settles into a preferred rock crevice to rest
• Strong interest in feeding stations (like a seaweed clip), often returning to the same spot repeatedly

Provide a 120-gallon-or-larger aquarium with open swim lanes and plenty of established rock to browse throughout the day. Offer marine algae/nori regularly (and keep it available in a clip when possible), backed up with herbivore pellets and mixed frozen foods in small, frequent feedings. In mixed-tang systems, many hobbyists improve introductions by using an acclimation box and spreading feeding stations to keep the tank’s attention divided.

How long does it take for a Powder Blue Tang to start using a nori clip?
Many settle into clip-feeding after a short adjustment period; keeping the clip in the same location helps it become part of the daily routine.

Does it need a specific “sleeping cave”?
They often choose a regular rock crevice to wedge into at night; once they pick a spot, they tend to reuse it.

Why do people put a mirror on the glass during tang introductions?
A mirror can redirect attention and “reset” the focus during the first few days, giving new fish time to blend into normal tank traffic.

Is it normal for it to patrol the whole tank instead of staying in one area?
Yes—many keepers describe Powder Blues as full-tank cruisers that repeatedly circle the display, especially once they’re comfortable.

If I’m adding more than one tang, what’s a common way to reduce early chasing?
Hobbyists often report better results when fish can see each other first (acclimation box) and when food is offered at multiple points so no single area becomes the only “hotspot.”

Each fish is checked for strong appetite and activity before we approve it for your tank.