SeafanEmergencies

LPS

Acan

Micromussa lordhowensis (formerly Acanthastrea lordhowensis)

Also sold as Acan lord

Acan (Micromussa lordhowensis)
Photo: Haplochromis, CC BY 2.5, via Wikimedia Commons
Type
LPS
Care level
Beginner to intermediate
Light
50 to 150 PAR (low)
Flow
Low
With neighbours
Spreads or stings mildly

Safety: handling acan

Fresh cuts produce lots of slime; gloves and eye protection when fragging

How do you care for acan?

Placement

Low to mid, sand or shaded ledge

Flow

Gentle for colonies; medium for fresh frags to keep cuts clean

Feeding

Target feed small meaty foods 2 to 3 times a week

Growth

Moderate; adds polyps at edges

Water quality

Stable alkalinity and calcium; Reef Builders gives 8 to 12 dKH, 400 to 450 ppm calcium

How much light does it need?

Sources put it at about 50 to 150 PAR, measured where the coral sits. Start a new coral at the low end and raise it over weeks.

Low to moderate light; start near 50 to 80 and raise slowly.

Which neighbours are safe?

Sweepers can sting neighbours typical, check

Several cm

Fish

Fish known to nip this group of corals, or small enough to be caught by it.

Take care (9)

Other corals

Corals that can harm this one if placed too close.

Take care (10)

  • Hammer coralHammer coral stings neighbours up to about 15 cm away at night; keep the acan out of reach.
  • Frogspawn coralFrogspawn coral stings neighbours; keep the acan out of reach.
  • Torch coralTorch coral stings neighbours; keep the acan out of reach.
  • GalaxeaGalaxea stings neighbours up to about 15 cm away at night; keep the acan out of reach.
  • Horn coralHorn coral stings neighbours; keep the acan out of reach.
  • Fire coral (not Acropora millepora)Fire coral (not Acropora millepora) stings neighbours; keep the acan out of reach.
  • Bubble tip anemoneBubble tip anemone stings neighbours; keep the acan out of reach.
  • Mini maxiMini maxi stings neighbours; keep the acan out of reach.
  • Carpet anemones (Haddon's, giant)Carpet anemones (Haddon's, giant) stings neighbours; keep the acan out of reach.
  • Ritteri anemoneRitteri anemone stings neighbours; keep the acan out of reach.

Invertebrates

Invertebrates that may nip corals when hungry.

Take care (3)

These checks follow the reasons fish and invertebrates clash: same species or genus, similar shape, mouth size, temperament, food, burrows, tank size and the order they are added. Individual animals differ; every source agrees on that.

Pests, dips and quarantine

Few specific

Iodine dip after fragging

No dip reliably kills pest eggs, so a dip lowers the risk rather than removing it. Inspect new frags with a torch after lights out, including the underside and the plug.

Sources

  1. Reef Builders, Acan lord care, 17 Feb 2025Read 21 October 2026, read in full.

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