Duncan Coral

Duncanopsammia axifrons

A friendly, fast-growing LPS that visibly loves being fed — very beginner-friendly.

Difficulty: BeginnerLPS coral

The Duncan coral (Duncanopsammia axifrons) is the friendliest LPS there is — a fast-growing, peaceful, feeding-loving coral that visibly perks up at dinnertime and multiplies its heads on its own. No stinging sweepers, low light and flow: it's the ideal first LPS.

📊 What keepers actually ask: Duncan is the coral new reefers fall for because it “does something” — it reaches out for food. So the top question is simply “how and how often do I feed it?” (answer: meaty foods, once or twice a week).

Care at a glance

Colony / form	Clusters of round, daisy-like polyps on a branching skeleton; adds new heads readily, so a 1–2 head frag becomes a showpiece.
Lighting	Low-to-moderate — about 50–150 PAR; not fussy.
Water flow	Low — bottom or sand, gentle flow. In high flow it won't open well or catch food.
Placement	Lower rock or the sand bed in a calmer, lower-flow spot; leave the upper high-light zones for other corals.
Temperature	75–82°F (24–28°C).
pH	8.1–8.4.
Specific gravity	1.023–1.026 (reef-standard ≈35 ppt).
Other targets	LPS build a stony skeleton — keep alkalinity (≈8–11 dKH), calcium (≈400–450 ppm) and magnesium (≈1300–1450 ppm) stable.
Feeding	Photosynthetic AND an eager hunter — it loves meaty foods (brine, mysis, cyclops, small shellfish). Feed once or twice a week for noticeably faster growth.
Growth & spread	Fast, especially when fed — it keeps adding heads, so a small frag fills out into a big colony over time.
Natural range	Indo-Pacific, including Australian waters.

Beginner-friendly, done right. Genuinely the best beginner LPS: hardy, peaceful (no aggressive sweeper tentacles), undemanding on light and flow, and it rewards feeding so visibly that it's a joy to keep. Put it low in gentle flow, feed it now and then, keep chemistry stable, and it thrives and spreads.

Keep those numbers steady. This coral's alkalinity, calcium and magnesium only keep it safe when they're stable. If one reads low, our free reef dosing calculator works out exactly how much to add for your water volume — and splits it safely over days.

Where does it go? Light, flow and placement make or break a coral. Our free coral placement guide shows the PAR, flow and tank zone this coral wants — and what else thrives in the same spot.

The fish store gets these wrong

Common myths, kindly corrected — no shame for having believed them.

“Corals don't really need feeding.” Duncan is the coral that proves otherwise — it's an active hunter that grows noticeably faster with regular meaty feedings, on top of its light-powered energy.
“All LPS have aggressive sweeper tentacles.” Not Duncan — it's peaceful and safe to place near other calm corals, unlike the stinging Euphyllia.

Before you buy

Pick a low, gentle-flow spot (rock or sand).
Have meaty foods ready — it loves to eat.
Keep alk/Ca/Mg stable (it builds a skeleton).
Great first LPS — no special aggression precautions.

Signs something's wrong

A struggling coral is almost always telling you about light, flow or water — here's what to watch for:

Polyps staying closed or shrunken — usually too much flow (move it lower/calmer) or a chemistry swing.
Not extending feeder tentacles at feeding time — check flow and water quality.
Receding flesh / bare skeleton — an alk/Ca swing; stabilise chemistry.

Never

Never put Duncan in high flow — it won't open or feed.
Never assume it needs strong light — moderate is plenty.
Never let alkalinity swing.

Common duncan coral questions

Is Duncan coral a good beginner coral?

It's one of the best beginner LPS — hardy, peaceful (no stinging sweeper tentacles), undemanding on light and flow, and it responds so visibly to feeding that it's very rewarding.

How do I feed a Duncan coral?

Offer meaty foods — brine shrimp, mysis, cyclops or small pieces of shellfish — target-fed to the polyps once or twice a week. It's an active hunter and grows noticeably faster when fed, on top of its photosynthesis.

Where should I place a Duncan coral?

Low in the tank — on rock or the sand bed — in a calmer, lower-flow, moderate-light spot. In high flow it won't open properly or catch food.

Is Duncan coral aggressive to other corals?

No — Duncan is peaceful, with no aggressive sweeper tentacles, so it's safe to place near other calm corals (unlike the stinging Euphyllia).

How fast do Duncan corals grow?

Fast for an LPS, especially when fed — it keeps adding new heads, so a small 1–2 head frag can fill out into a large showpiece colony over time.

Sources & further reading

This guide was written and fact-checked against these authorities. It's honest, general guidance — not a diagnosis, and not a substitute for an aquatic vet or your own test kit:

Saltwater Aquarium Blog — Duncan Coral Care Guide — light, flow, placement, feeding, fragging
Tidal Gardens — Duncan Coral Care — care, feeding, growth
Bulk Reef Supply — How to Care for LPS Corals — LPS chemistry, feeding

Written and fact-checked by The Coralkin Team against marine-aquarist sources — if your duncan coral is struggling, it's almost always a light, flow or water-chemistry issue — check those first and ask an experienced reefer. We never guess a care number.

🔬 Review status: team-written and fact-checked against cited sources · not yet reviewed by a marine vet. How we research & fact-check →

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