Acanthastrea lordhowensis — Micromussa lordhowensis
There are corals that impress because of their structure. This one impresses because of its tissue, volume, and color. But that is also exactly why it can be deceptive. When a lordhowensis is doing well, it looks easy. When it is poorly placed, decline usually starts quietly: less inflation, less color, a tighter edge, thinner tissue. This profile is designed to read that process before it reaches the skeleton.
Introduction: an LPS that seems forgiving… until it isn’t
The so-called «Acan Lord» has earned a reputation as an attractive and relatively grateful coral. That reputation is partly true, but incomplete. It usually does not fail because of a single brutal cause, but because of accumulated micro-mistakes: too much light, uncomfortable flow, chronic hunger, aggressive neighbors, or buying a specimen that is already tired.
The right reading is not «it can take a lot.» The right reading is this: it gives you room for error if the system is coherent.
Experience — A healthy lordhowensis does not look «hard.» It looks alive, inflated, and purposeful in its tissue. If it starts to look «sharper,» something in the system is no longer fitting together.
Identification: what you really need to look at
| Feature | What to expect | Why it matters |
|---|---|---|
| Polyps | Large, fleshy, round or oval | If they look flat or tight, suspect stress or incomplete adaptation. |
| Mouth | Central and well defined | It helps you read feeding response and real turgor. |
| Visible skeleton | It should not dominate the view in a healthy coral | When it starts to show clearly, the safety margin is shrinking. |
| Color | Strong contrast but not «impossible neon» | Extreme color in a photo does not always equal real health. |
Taxonomy: why it is no longer, strictly speaking, an Acanthastrea
For years the hobby grouped this coral under Acanthastrea. The morphological and molecular revision of Lobophylliidae changed that framework: the accepted name today is Micromussa lordhowensis. The change is not a laboratory whim; it affects how we understand its relationships and why some corals that «look similar» in shops are not actually that close.
What is useful for AtlasReef
- You can title the profile «Acanthastrea lordhowensis» for SEO and hobby recognition.
- Inside the article, it is worth clarifying that the accepted name is Micromussa lordhowensis.
- This helps avoid casually mixing it with other commercial «acans.»
What this clarification avoids
- Confusing old taxonomy with current taxonomy.
- Assuming that all colorful, fleshy-polyp corals share the same requirements.
- Buying by store label without looking at the real morphology.
Biotope and natural context
Its ecological logic fits a thick-polyp coral that combines photosynthesis with food capture when conditions allow. That already gives you a practical clue: it does not need to be treated like an SPS.
When the aquarist subjects it to the idea that «more light = better color,» the classic sequence often begins: forced color, thinner tissue, less inflation, and accumulated stress.
Recommended setup: the system where it really shines
What suits it well
- A stable, mature reef without silly swings.
- A low or lower-middle area of the aquarium as the starting point.
- Indirect flow, enough to move water but not enough to «whip» the tissue.
- Space around it: this coral is not as innocent as it looks.
What damages it
- Moving it too high too soon in search of color.
- Direct flow that prevents comfortable inflation.
- Aggressive neighbors at short distance.
- A newly built setup that still does not «think» like an ecosystem.
This coral improves greatly when the aquarium already has biological maturity, not just chemical numbers.
Placement in the tank: where it starts to work
The method that works best with this coral is boring, and that is why it works: start conservatively. Place it in an area of low to moderate light and gentle flow. Then observe inflation, color, opening, and feeding response.
| Scenario | Reading | What you do |
|---|---|---|
| Very inflated, stable color | Energy intake is working well | Keep the position. |
| Well inflated but dark | Not a problem by itself | Do not move it up out of aesthetic anxiety. |
| Less inflation and washed-out color | Too much light or flow stress | Reduce energy / relocate / observe. |
| Thin tissue and skeleton showing | You are already late | Gentle intervention, not abrupt intervention. |
Water parameters: practical ranges, no theatrics
| Parameter | Practical range | What really matters |
|---|---|---|
| Temperature | 24–26 °C | Stability matters more than chasing a pretty number. |
| Salinity | 1.025–1.026 | Avoid sawtooth swings from top-off or poorly prepared water changes. |
| pH | 8.0–8.4 | Do not turn an LPS coral into a victim of nervous corrections. |
| Alkalinity | 7.5–9 dKH | More than the number itself: consistency. |
| Calcium | 400–450 mg/L | A growth foundation, but not enough by itself to explain tissue health. |
| Magnesium | 1250–1400 mg/L | Supports the system’s general balance. |
| Nitrates | Low to moderate | An LPS does not need «dead» water. |
| Phosphates | Low but detectable | Chasing absolute zero usually ends worse. |
What works and what doesn’t
✔ Works
- Stable routine.
- Reasonable changes.
- Reading the coral before making impulsive chemical reactions.
✖ Doesn’t work
- Moving it every three days.
- Correcting several parameters at once.
- Confusing «very clean water» with LPS health.
Feeding: yes, photosynthesis, but not only that
Like other LPS corals, it combines input from its photosynthetic symbionts with food capture. That does not mean force-feeding it without control. It means understanding that it can benefit from target feeding or water-column feeding if the system handles it well.
- Small, manageable particles.
- Best when the coral shows tentacle response.
- A little, done well, is better than a lot, done dirty.
- If the tissue is tight or the coral closes up, do not insist.
Daytime and nighttime expansion, and how to read behavior
One of the most common mistakes is judging the coral from a single photo or at a single hour. There is a daytime reading and there is a nighttime reading. The difference between them helps you know whether the coral is comfortable, in defensive mode, or still has physiological margin.
Experience — A healthy coral is not always «fully open,» but it does project confidence: it does not look shrunken, sharpened, or exhausted.
Compatibility: with fish, invertebrates, and other corals
Good compatibility
- Reef-safe fish that do not pick at tissue.
- Neighbors that are not too aggressive and are kept at a distance.
- Cleanup invertebrates that do not stress it constantly.
Delicate compatibility
- Corals with strong sweepers or pronounced chemical warfare.
- Fish that nip fleshy LPS corals.
- Overly dense setups where corals «touch just because.»
| Tank mate | Risk | Practical reading |
|---|---|---|
| SPS | Low–medium | Compatible if you are not competing absurdly for space/light. |
| Other fleshy LPS | Medium | Many «tolerate each other» until they stop. Leave margin. |
| Euphyllia and similar aggressive corals | Medium–high | Better not to trust luck. |
| Angels / nippers | High | Fleshy tissue is a constant temptation. |
Coral ICC — coral condition index
Skeleton dominant / tissue collapsed
- Skeleton highly visible.
- Severe loss of color.
- Polyps without useful inflation.
Tissue present but thin
- Irregular or washed-out color.
- Tight edges.
- Poor feeding response.
Stable coral
- Fleshy, inflated tissue.
- Visible mouth but not tight.
- Consistent color and predictable behavior.
Very inflated / heavily fed
- Striking appearance.
- Do not confuse short-term beauty with long-term balance.
- Avoid overfeeding just to get «more.»
Myths vs facts
| Myth | AtlasReef fact |
|---|---|
| «The more light, the better the color.» | Not necessarily. In this coral, more light can also mean more stress. |
| «If it isn’t fully inflated, something is wrong.» | There is daytime variation, adaptation variation, and contextual variation. The trend matters, not a single photo. |
| «It is a passive coral.» | No. It can compete and it needs space. |
| «It lives only from light.» | No. It can capture food and benefit from a sensible feeding strategy. |
| «If it bleaches a little, it’s no big deal.» | No. Partial bleaching is an alarm, not an anecdote. |
Buying guide: what to look at before you pay
I would buy it
- Thick, even tissue.
- Well-defined mouths, but not collapsed.
- Natural color, not suspiciously forced.
- Clear polyp separation without large bare areas.
I would hold back
- Bases with excessively exposed skeleton.
- Very pretty color but obviously thin tissue.
- Massively deflated polyps with no visible response.
- Shipping damage, abrasion, or bite marks.
Experience — The best «bargain» on a tired lordhowensis often ends up being the most expensive coral in the whole setup.
Quick risk estimator
Low risk
Mature reef, moderate light, indirect flow, free space, inflated coral, and stable color.
Medium risk
Newly arrived coral, provisional position, still ambiguous behavior, irregular feeding.
High risk
Strong light, close neighbors, tight tissue, fading color, and an aquarist moving it every week.
Propagation and fragmentation
In reefkeeping, the real «breeding» you are likely to see is usually not sexual reproduction but fragmentation. That demands caution: the fact that the coral is marketable and can be cut does not mean every cut at every moment is a good idea.
Health and problems: from early warning to real loss
| Signal | Likely reading | Smart response |
|---|---|---|
| Paler color | Light or physiological stress | Review placement before using aggressive chemistry. |
| Less inflation | Uncomfortable flow, hunger, or poor adaptation | Observe the day/night pattern and the surroundings. |
| Retracted tissue | Serious alarm but still reversible | Reduce system pressure and avoid overhandling. |
| Skeleton dominant | Advanced damage | Prioritize stability, not instant miracles. |
Classic mistakes with this coral
Beginner mistakes
- Buying for color without looking at the tissue.
- Placing it too high from day one.
- Assuming it is «decorative» and not reading its behavior.
- Placing it right next to other LPS corals because «it looks good.»
Advanced mistakes
- Trying to squeeze out color with too much light.
- Underestimating chemical warfare or coral sweeping.
- Overfeeding to chase extreme inflation.
- Correcting too much at the first symptom instead of reading the trend.
Useful scientific and taxonomic evidence
A selection of reference sources for this profile. The goal here is not to fill the article with citations for show, but to leave a solid foundation for taxonomy, biology, and conservation context.
1) Taxonomy: the change from Acanthastrea to Micromussa
2) Reproduction and larval dispersal
3) Trade and conservation context
4) AtlasReef practical application
What do we take back to the tank? That the taxonomic change is real, that the coral is biologically more interesting than it first appears, that its natural reproduction has nothing to do with hobby fragmentation, and that the trade in colorful LPS corals exists within a broader exploitation context that deserves a deeper look.
Recommended reading
To complete the profile without leaving the AtlasReef ecosystem:
«A good lordhowensis is not measured only by the color it shows. It is measured by the calm way it lives within the system.»
— atlasreef
FAQ — frequently asked questions
Is it easy or difficult?
It is easier than many SPS corals, but it is not a «place it and forget it» coral. Its real difficulty lies in reading the tissue closely and choosing the right placement.
Does it need direct feeding?
Not always, but it can benefit from a sensible feeding strategy, especially during recovery or to support fleshy tissue.
Can it bleach even if the parameters are «fine»?
Yes. Light, flow, transport, aggression from neighbors, or a combination of factors can trigger color loss even when the numbers look correct.
Should I place it on the sand or on rock?
Both can work depending on the setup, but always with stability and while avoiding unnecessary exposure to light or aggressive sweeping.
Is it still correct to call it Acanthastrea lordhowensis?
In hobby language people will understand you, but the accepted name today is Micromussa lordhowensis.