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🐟 AquaticCare difficulty: IntermediateLegal complexity: Low

Micromussa (Micro Lord)

Micromussa amakusensis · also called Micro Lord, Acan Micromussa, Micro Acan, Micromussa Lord

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Micromussa amakusensis (formerly placed in Acanthastrea, and previously known as Acanthastrea bowerbanki) is a small-polyp LPS prized for intensely fluorescent, multicolor corallites. It is a hardy, slow-growing reef coral well suited to intermediate hobbyists keeping low-to-moderate light and gentle flow. The 'Micro Lord' trade name is widely applied, though it historically referred to the related Micromussa lordhowensis.

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Quick facts

SizeEncrusting/plating colonies of small fleshy polyps; corallites roughly 5-10 mm each, colonies commonly 3-15 cm across in aquaria
Lifespan10–50 years
Social needssolo
Native regionIndo-Pacific reefs (Japan/Amakusa region, Western Pacific and broader Indo-Pacific)
OriginOld World
Climate🌴 Tropical
Water type🌊 Marine
FamilyLobophylliidae
GenusMicromussa

Part of the LPS Corals

Large-polyp stony corals (brains, Euphyllia, Goniopora, Scolymia, Lobophyllia, Favites, Acan, Dendro, Octospawn) with fleshy polyps over a calcium-carbonate skeleton. Intermediate-care reef corals that appreciate moderate light/flow and direct feeding.

Acanthophyllia (Meat Coral)AlveoporaBlastomussaBubble coralCandy cane coralChalice coralDendrophyllia (Branching Sun Coral)Duncan coralElegance coralFavites (Pineapple Brain)Frogspawn coralGoniopora (Flowerpot Coral)Hammer coralLobophyllia (Lobed Brain / Meat Coral)+7 more →

Habitat & space requirements

From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.

Photo coming soon
Minimum

Stable nano reef

20+ gal / SG 1.025 / Alk 8-9 dKH / Ca 420-440 / Mg 1300-1400

LPS coral — needs more stable Alk/Ca/Mg than soft corals. Medium light, LOW flow (sweepers/tentacles need calm to extend). Some target-feeding helps. Micromussa (Micro Lord) — small-polyp version of Acan with intense colours; medium light + low flow.

Photo coming soon
Recommended

Established 40+ gal reef

40+ gal cycled 6+ mo / stable Alk

Established reef with calm pockets for tentacle extension. Target-feed mysis/PE pellet 1-2× weekly. Watch for sweeper tentacles stinging neighbours.

Photo coming soon
Ideal

Mature reef + LPS garden

75+ gal / show-quality stability

Mature mixed reef with dedicated LPS placement (low rockwork or sand) and spacing for sweepers. Stable parameters > peak parameters. Micromussa (Micro Lord) — small-polyp version of Acan with intense colours; medium light + low flow.

Life & growth stages

How this animal changes through its life — each stage often has its own care, diet and space needs.

Photo coming soon
Planula larva

Corals begin as a free-swimming planula larva released into the water column after spawning or brooding. The tiny, ciliated larva drifts and swims until it finds suitable hard substrate to settle on.

Photo coming soon
Single polyp

Once settled, the larva metamorphoses into a single founding polyp that secretes a calcium-carbonate (or proteinaceous) base and extends a ring of tentacles to feed. Reef-building corals begin laying down skeleton at this stage.

Photo coming soon
Mature colony

The founding polyp buds asexually into a colony of many genetically identical polyps, building the species' characteristic growth form — branching, plating, encrusting, or massive. A mature colony can reproduce and contributes to reef structure.

Color & pattern variants

Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.

Natural

Rainbow Micromussa

Highly sought morphs showing multiple contrasting colors (green/red/orange/blue) across the corallite, mouth, and wall. Naturally occurring color forms selectively propagated in the hobby.

Bleeding Apple / Red-mouth Lord

Deep red or maroon corallites with brightly contrasting green or orange centers; a classic Micro Lord look named for the rich red coloration.

Master / Ultra Lord

Trade names for exceptionally vivid, high-contrast color combinations; not distinct species but premium naturally colored selections grown out as named aquacultured lines.

UFO Micro Lord

RareIntermediate

A classic small-polyp Micro Lord with brick-red septal striping and, most distinctively, a vividly contrasting oral disc that glows yellow (sometimes green) like a little flying saucer at the center of each polyp.

Tip: Give it lower light and low-to-medium alternating flow; too much intensity can wash the trademark yellow oral disc toward a flat red, so keep it shaded on the sandbed or lower rockwork. These corals shift color quickly with lighting changes.

Rainbow Micromussa (Rainbow Acan Lord)

UncommonIntermediate

The catch-all Aussie-import rainbow Micro Lord: fat fleshy polyps splashing through red, orange, yellow, green, and blue across a single oral disc. These are the funky multicolor *Micromussa lordhowensis* (formerly *Acanthastrea lordhowensis*) pieces commonly called 'Acan Lords' or just 'Lords.'

Tip: Place under a bluer spectrum at moderate PAR; a stronger blue light helps hold the rainbow coloration, whereas hot white-heavy light tends to morph it toward dominant red/orange. Leave space between colonies, as Micromussa have a strong sting.

ECC Rainbow Road

Ultra-rareIntermediate

A standout designer Micro Lord with orange mouths shot through with blue patterning, wrapped in a mantle of concentric green, yellow, and red rings. A high-end collector rainbow that commands premium per-head pricing.

Tip: Treat it as a low-light, low-flow gem: keep it on the sandbed or a shaded ledge so the orange-and-blue oral disc stays bright, and spot-feed occasionally to keep heads plump and dividing.

Cherry Limeade Rainbow Micromussa

UncommonIntermediate

A dessert-named rainbow Micro Lord with a cherry-red base that fades into a pink outer layer, then transforms into a bright orange-and-blue rim. Notable for exceptionally large, fleshy polyps.

Tip: Give it the standard Micro Lord placement of lower light and gentle flow on the sandbed; the big polyps respond well to occasional target feeding, which speeds new head budding.

Raging Storm Micromussa

UncommonIntermediate

A bright two-tone Micro Lord ('Acan lord') morph dominated by vivid orange polyps with teal/green accents, sold as an aquacultured, quarantine-protected frag.

Tip: Low light, low flow, sandbed placement is ideal; this is a forgiving LPS that feeds readily, so the occasional meaty target feeding helps it spread.

Selectively bred (man-made)

Holy Grail Micromussa

RareIntermediate

The iconic blue-light showpiece of the Micro Lord world: a glowing lime-yellow oral disc ringed by deep blue, then bands of lime-green and yellow, finished with a wide cherry-red outer ring. Often called the industry's top aquacultured LPS for its jewel-like, rainbow-ringed polyps.

Tip: Keep it on the sandbed or a low rock shelf under modest light (~100-150 PAR) with gentle, indirect flow so the polyps inflate fully and the colors stay saturated rather than browning out. Target-feed a small amount of meaty frozen food about once a week.

TSA Freak Show Micromussa

RareIntermediate

A vendor-branded rainbow Micro Lord in the high-color 'freak show' tier, with bold multicolor polyps in the red/orange/green/blue range typical of top-shelf designer Micromussa.

Tip: Keep it on the lower third of the tank under softer light (~150 PAR) with gentle alternating flow; like other Micro Lords it shows best color and fullest polyp extension out of direct high-intensity light.

Jason Fox Holy Grail Micromussa

Ultra-rareIntermediate

A Jason Fox signature offering of the Holy Grail Micro Lord (*M. amakusensis*) showing striking concentric rings from the center out: neon green, then bright purple-green, into orange and red, finished by a ring of light blue, with polyps about half an inch across.

Tip: Medium-low to medium light (roughly 80-250 PAR) and low-to-medium flow keeps the tight color rings crisp; avoid blasting flow directly at the fleshy polyps, which can prevent full inflation.

Mardi Gras Acan (TSA Psycho Troll)

RareIntermediate

A festive multicolor Micro Lord in TSA's signature tier, with carnival-bright polyps mixing greens, oranges, reds, and blues. Frags run roughly three-quarter to one inch from the mother colony.

Tip: Keep it shaded and low in the tank with mild alternating flow; consistent moderate light prevents the brighter accent colors from bleaching toward solid red.

Habitat & enclosure

Keep in an established marine reef aquarium (typically 75+ L for a small frag colony) with stable reef parameters: temperature 24-27 C (75-80 F), salinity 1.025-1.026 SG, alkalinity 8-9.5 dKH, calcium 400-450 ppm, magnesium 1300-1400 ppm, pH 8.0-8.4. Low nitrate (1-10 ppm) and low phosphate (0.02-0.1 ppm) but not ultra-stripped water best preserves color and tissue. Mount on the low-to-mid rockwork or sandbed. As an LPS, it is intermediate in difficulty: less demanding than SPS but needing stable chemistry.

Substrate

No substrate is consumed; the colony is mounted to live rock or a frag plug/disc using reef-safe gel cyanoacrylate glue and/or two-part epoxy. A mature reef with live rock and a thin to moderate sand or bare-bottom base both work. Place where detritus will not settle on the polyps.

Equipment & setup

Marine reef setup: reliable heater (24-27 C), quality LED or T5 reef lighting at low-to-moderate intensity (roughly 50-120 PAR; it colors up best at lower PAR and can bleach if blasted), gentle indirect water flow from a wavemaker/powerhead (strong direct flow prevents polyp expansion), protein skimmer, and stable dosing or water changes to hold alkalinity/calcium/magnesium. RO/DI source water and a refractometer are essential.

Diet

Photosynthetic via zooxanthellae, supplying most energy under proper light. It is also an active feeder with short feeding tentacles that emerge mainly at night or when food is sensed. Target-feed 1-3x weekly with small meaty foods: finely chopped mysis, brine, oyster eggs, reef roe, or commercial LPS/coral pellets and powdered coral foods. Feeding noticeably improves growth, polyp extension, and color saturation.

Behavior & temperament

A sessile colonial coral; 'behavior' is its growth and chemical/physical interaction with neighbors. Micromussa is only mildly aggressive: it lacks the long sweeper tentacles of Euphyllia or Galaxea and relies mainly on short feeder tentacles, though at night it can extend modest sweepers (a few cm) and mesenterial filaments to sting corals that touch it. Give a few cm of clearance from other corals. Not handleable; corals are not handled, and reef tank work should be done with care as some hobbyists are sensitive to coral mucus or to palytoxin from co-housed zoanthids.

Health

Generally hardy. Main threats are brown jelly infection (treat by fragging/removing affected tissue and dipping), tissue recession from unstable alkalinity swings, and bleaching from excessive light. Watch for Acan/Micromussa-eating nudibranchs and pyramidellid-type pests; quarantine and coral-dip new frags (e.g., iodine or commercial coral dip) before adding. Steady parameters and gentle handling prevent most issues.

Tips, DIY & hacks

Acclimate light slowly over 1-2 weeks to avoid bleaching this lower-light coral. Aim PAR around 60-100 for best fluorescence; too much light browns it out, too little flow lets detritus smother it. Spot-feed after lights-out once tentacles emerge for fastest growth. When fragging, cut between corallites with a band saw or bone cutters, dip, and glue to a plug; it heals readily. Stable alkalinity matters more than chasing ultra-low nutrients.

Sources

  1. Corals: A Quick Reference Guide (Julian Sprung) (reference)
  2. WoRMS - Micromussa amakusensis (Veron, 1990) (database)
  3. Reef2Reef - Micromussa/Acan Care (care guide)