Acan Corals

Acan Corals

Acanthastrea spp.

💧Moderate Flow
☀️Low to Moderate Light
Beginner to Intermediate Difficulty
Acan Coral (Acanthastrea spp.), are a popular group of large polyp stony (LPS) corals known for their bold colors, fleshy polyps, and ease of care. These corals form low, encrusting colonies with wide mouths and can inflate dramatically when feeding or under ideal conditions. Acans come in a stunning variety of colors — from neon greens and fiery oranges to rare rainbow patterns — making them a favorite for collectors. They thrive in low to moderate light with a moderate flow and are a great choice for both beginners and advanced reef keepers.

Classification

KingdomAnimalia
PhylumCnidaria
ClassAnthozoa
OrderScleractinia
FamilyLobophylliidae
GenusAcanthastrea
SpeciesMultiple, including:
  • Acanthastrea echinata
  • Acanthastrea rotundoflora
  • Micromussa lordhowensis (former)
  • Homophyllia bowerbanki (former)

In the reefkeeping community, 'Acan Coral' commonly refers to several species within the Acanthastrea genus. However, some species previously classified as Acanthastrea have been reclassified - for example, A. lordhowensis is now considered a Micromussa, and A. bowerbanki has been moved to the Homophyllia genus. Despite these taxonomic changes, these corals are still widely referred to as Acans when searching or filtering in the hobby.

Quick Care Tips

Lighting
Low to Moderate
Low
Moderate
High
Flow
Moderate
Low
Moderate
High
Difficulty
Beginner to Intermediate
Beginner
Intermediate
Advanced

Frequently Asked Questions

Do Acan corals need to be fed?

While Acan corals can survive on light and dissolved nutrients, they thrive when target-fed. Feeding is highly recommended as it promotes faster growth, more vibrant coloration, and better overall health.

Are Acan corals aggressive?

Yes, many Acan corals are aggressive and can sting nearby corals. It's best to place them with enough space around their colony to prevent contact, especially at night when their short sweeper tentacles may extend.

Why are my Acans losing or changing color?

Color changes in Acans are often caused by shifts in lighting intensity or unstable water parameters. It's common for new heads to display slightly different colors as they grow. Acans generally prefer lower light levels, and high-intensity lighting — especially strong blue channels — can cause fading or color morphing over time.

Are Acan corals good for beginners?

Yes, Acan corals are considered beginner-friendly LPS corals. They are hardy, adaptable to a range of conditions, and don't require intense lighting. With stable parameters and target feeding, they can thrive and display vibrant colors even in newer reef tanks.

Marketplace Overview

Current Listings
523
Lowest Price
$17
Highest Price
$1600
Median Price
$70

Shop over 523 Acan Corals

Top Sellers

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Queen City Corals
173 Acan Listings
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Top Shelf Aquatics
112 Acan Listings
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Corals.com
91 Acan Listings
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Austin Aqua Farms
37 Acan Listings
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Vivid Aquariums
33 Acan Listings
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World Wide Corals
24 Acan Listings

How to Choose a Healthy Acan Coral

  • Polyp Health:

    Healthy Acans should have inflated, fleshy polyps that are responsive to light and movement. Avoid specimens with deflated, recessed, or damaged tissue.

  • Growth Signs:

    Frags showing new heads forming around the edges at the base are actively growing and generally healthy. This is a good sign of stability and low stress.

  • Fresh Cuts vs. Healed Colonies:

    Healed frags with visible tissue growth over the skeleton are more stable than fresh cuts. However, fresh frags can still thrive with good care.

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