Micromussa lordhowensis – Acan Coral

Micromussa lordhowensis, known among hobbyists as Acan coral or Acan lord, is a popular LPS coral in reef aquariums. The species was previously known as Acanthastrea lordhowensis, which is why it is often still simply referred to as “Acan” among enthusiasts.

The coral forms low coral colonies where individual polyps are clearly distinguishable and round. Each polyp has a mouth in the center surrounded by thick tissue that can swell significantly under good conditions or during feeding.

Micromussa lordhowensis is especially known for its spectacular color patterns. Color variations range widely, with shades including turquoise, red, orange, green, and violet, as well as various multi-colored combinations. In this color morph, the coral combines turquoise and red hues that can fluoresce strongly under blue aquarium lighting.

In a reef aquarium, Micromussa usually thrives in the lower or middle sections of the aquarium, where lighting is low to moderate and flow is gentle. Under good conditions, the polyps expand, and the coral grows new polyps around its edges, forming a larger growth over time.

Characteristics

LPS coral colony formed by round polyps

known for strong and contrasting colors

polyps can swell significantly during feeding

grows as new polyps form at the edges of the colony

often strong fluorescence under blue lighting

Care Requirements

Feature Recommendation

Difficulty easy – medium

Lighting low – moderate

Flow low – moderate

Placement in aquarium bottom – middle

Growth rate moderate

Good to know

Micromussa lordhowensis often responds well to targeted feeding with, for example, mysis shrimp or other small meaty foods. Feeding can accelerate growth and help the coral form new polyps.

Suitability

well suited for reef aquariums

generally compatible with fish and invertebrates

also suitable for beginners, provided lighting is not too strong