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Magnificent anemone

Heteractis magnifica · also called Ritteri anemone, Magnificent sea anemone, Heteractis ritteri, Radianthus magnifica

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Magnificent anemone

The magnificent (ritteri) anemone is a large, striking host anemone with a brightly colored column—often purple, blue, green, red, or magenta—and a disc of long flowing tentacles. It is the iconic open-water anemone that perches high on rock or coral heads and hosts a wide range of clownfish. It is genuinely demanding: it needs intense light, strong flow, and pristine, perfectly stable water, and it has a deserved reputation for declining in less-than-ideal systems, making it suitable only for experienced reefers.

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Quick facts

SizeOral disc commonly 12-20 in (30-50 cm), reaching over 3 ft (1 m) in the wild; among the largest host anemones.
Lifespan10–100 years
Social needssolo
Native regionIndo-Pacific
OriginOld World
Climate🌴 Tropical
Water type🌊 Marine
FamilyStichodactylidae
GenusHeteractis

Part of the Sea Anemones

Stinging, sessile cnidarians ranging from clownfish-hosting giants to nano-sized carpet species. Many are demanding, mobile, and can sting corals or be drawn into pumps — careful placement and rock-stable water are essential.

Bubble tip anemoneCarpet anemoneCondy anemoneLong tentacle anemoneMini Maxi AnemoneRock flower anemoneSebae Anemone

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

Established 30-gal reef

30+ gal cycled 6+ mo / SG 1.025 / Alk 8-9 / NO3 < 10

Anemones need ESTABLISHED reefs — never new tanks. Strong reef-spectrum light, moderate flow. They WANDER — secure intake guards (anemone-rated covers on powerheads). Magnificent (Heteractis magnifica) is beautiful but DIFFICULT — high light + flow + frequent feeding; many bleach in captivity.

Photo coming soon
Recommended

Mature 75-gal reef

75+ gal mature reef / strong light / chaotic flow

Mature reef with stable parameters + strong reef-spectrum LED + chaotic flow. Will host compatible captive-bred clownfish (Bubble Tip = Amphiprion ocellaris/percula; Carpet/Magnificent/Sebae host larger clowns).

Photo coming soon
Ideal

Show reef + bonded clownfish pair

100+ gal show reef + pair of clownfish

Mature 100+ gal show reef with a bonded pair of CAPTIVE-BRED clownfish hosting. Wild-caught anemones bleach easily; insist on aquacultured/maricultured stock. Magnificent (Heteractis magnifica) is beautiful but DIFFICULT — high light + flow + frequent feeding; many bleach in captivity.

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.

Mature colony stage
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
Purple baserepresentative

Purple base

Wild form with a vivid purple column and contrasting tentacles; among the most sought-after color forms.

Green/tan tentacle formsrepresentative

Green/tan tentacle forms

Specimens with green or tan tentacles over colored columns (blue, red, or magenta), reflecting natural geographic color variation.

Standard Tan / Brown Magnificarepresentative

Standard Tan / Brown Magnifica

CommonAdvanced

The base wild form with a tan-to-brown column (foot) and brownish tentacles tipped in lighter color. The most frequently imported and the cheapest *H. magnifica*.

Tip: Provide very strong PAR (200-350+) AND strong, turbulent flow against the column — magnificas are open-water anemones that 'walk' until conditions suit them, so over-feed and stabilize the tank for months before adding clownfish.

Green Magnificarepresentative

Green Magnifica

CommonAdvanced

A green-tentacled wild color form, often paired with a green or olive column. One of the most commonly seen colored magnificas in the trade.

Tip: Green is the most light-stable color form; keep it high in the tank under intense light so its zooxanthellae stay dense — a magnifica placed too low will bleach and wander.

Purple-Base (Purple Foot) Magnificarepresentative

Purple-Base (Purple Foot) Magnifica

UncommonAdvanced

Prized form with a vivid purple or magenta column and contrasting green/tan tentacles. The purple foot is the headline trait collectors pay for.

Tip: The purple column pigment is non-photosynthetic protective coloration — bright light maintains it, but a stressed/wandering animal will dump color first, so do not move it once it settles.

Red / Rose Magnificarepresentative

Red / Rose Magnifica

RareAdvanced

A red-to-rose column form, far less common than purple or tan and usually wild-collected from specific localities.

Tip: Quarantine and target-feed heavily on arrival — deeply colored magnificas ship poorly and a hungry, freshly imported specimen is the most likely to wander into a powerhead.

Blue / Teal Tentacle Magnificarepresentative

Blue / Teal Tentacle Magnifica

RareAdvanced

Tentacles flush blue or teal under actinic-heavy lighting; an uncommon and striking wild form.

Tip: The blue is largely a fluorescent response — run heavier blue/actinic spectrum to pop the color, but never compromise on total intensity, which this species absolutely requires.

Yellow / Gold Magnificarepresentative

Yellow / Gold Magnifica

Ultra-rareAdvanced

A solid yellow-to-gold column and tentacle form, among the rarest and most expensive *H. magnifica* offered.

Tip: These pale-pigmented animals have the smallest bleaching margin of any color form — only attempt one in a mature, rock-solid tank, and never on a fresh system.

Purple-Base Magnificent Anemonerepresentative

Purple-Base Magnificent Anemone

CommonAdvanced

The classic Heteractis magnifica with a smooth, brightly colored column (typically purple, blue, or magenta) and a wide crown of evenly tapered tentacles with rounded tips. The vivid solid-colored base is the species' hallmark.

Tip: This is a high-light, high-flow surface anemone, mount it high on the rockwork under strong PAR (200+) with strong indirect flow rather than burying it in sand; it will roam until it finds a bright, well-lit perch.

Green Magnificent Anemonerepresentative

Green Magnificent Anemone

CommonAdvanced

A magnifica with a green-to-tan column and green-tipped tentacles, the more subdued cousin of the brightly colored bases. The body is the same smooth-column, surface-dwelling form.

Tip: Give it the brightest spot in the display under high PAR and strong flow; place it on upper rockwork near the light, never on the sand bed, and ensure rock-solid water parameters before introducing one.

Red / Maroon Base Magnificent Anemonerepresentative

Red / Maroon Base Magnificent Anemone

UncommonAdvanced

A premium magnifica selected for a deep red-to-maroon column, one of the most striking base colors in the species. The brilliant red foot against a pale tentacle crown is the draw.

Tip: Demands the same intense lighting and flow as other magnificas; place high under strong light and resist moving it once it settles, as repeated relocation stresses this species badly.

Rainbow / Multicolor Magnificent Anemonerepresentative

Rainbow / Multicolor Magnificent Anemone

RareAdvanced

A top-grade magnifica whose column and tentacle bases blend multiple colors, blues, purples, pinks and greens, rather than a single solid hue. The mixed coloration on the smooth column is what separates it from standard grades.

Tip: Treat as the most demanding grade: maximum stable light, strong flow, and pristine parameters; mount high and leave undisturbed so it can acclimate its zooxanthellae to your lighting.

Purple Tip Ritterirepresentative

Purple Tip Ritteri

CommonAdvanced

The classic and most commonly imported magnifica form: a vivid magenta-to-purple column with long, flowing tan-to-mauve tentacles ending in bright purple-pink finger tips.

Tip: Give it high-intensity light high on the rockwork (or on an open glass wall it can grip) with strong, intermittent flow; magnifica wants to climb toward the brightest spot rather than sit in the sand.

Green Tip Ritteri (Purple Base)representative

Green Tip Ritteri (Purple Base)

UncommonAdvanced

A purple-based magnifica whose tentacles carry green coloration and green-tipped ends, an uncommon pairing that makes the green pop against the dark column.

Tip: Acclimate light slowly over weeks; the green and purple pigments hold best under strong photosynthetically-active reef LEDs or T5 once the animal has settled and stopped wandering.

Yellow Tip Ritterirepresentative

Yellow Tip Ritteri

CommonAdvanced

A magnifica with long tentacles tipped in bright yellow, often over a tan, brown, or purple base; the yellow finger tips are the signature feature.

Tip: Position it where it gets both strong light and direct flow on the tentacle tips; magnifica are open-water anemones that color up and feed best in a high-flow lifestyle, unlike sand-dwelling species.

Red-Tipped Ritterirepresentative

Red-Tipped Ritteri

UncommonAdvanced

A magnifica showing warm red to red-orange coloration on the tentacle tips, frequently paired with a reddish or magenta column.

Tip: Strong lighting is essential to maintain the red pigment; under weak light these warm tones fade toward brown, so keep it high in the tank near the most intense light field.

Red / Red-Magenta Base Rainbow Ritterirepresentative

Red / Red-Magenta Base Rainbow Ritteri

RareAdvanced

The most coveted wild magnifica: a deep red-to-magenta column with multicolor tentacles, the combination hobbyists call a 'rainbow' magnifica.

Tip: These high-color animals demand pristine, stable water plus very strong light and flow to hold their pigment; do not buy one unless the tank is mature and the lighting can support a true high-light anemone long term.

Starry Night Ritterirepresentative

Starry Night Ritteri

UncommonAdvanced

A vendor-coined name for a magnifica whose column or tentacle bases carry a speckled, starry pattern of lighter flecks against a darker body.

Tip: As with all magnifica, mount it high under strong light and feed occasional meaty foods; the contrast pattern shows best once the animal is fully expanded in good light and flow.

Selectively bred (man-made)
Ultra Purple Neon Yellow Tip (Aquacultured)representative

Ultra Purple Neon Yellow Tip (Aquacultured)

RareAdvanced

An ultra-grade magnifica with a saturated purple column and electric neon-yellow tentacle tips, selected and grown out in captivity.

Tip: Even though tank-raised, treat it like any magnifica: high light, strong intermittent flow, and a spot it can anchor securely; aquacultured pieces still wander until they find their light.

Habitat & enclosure

In the wild it perches in the open on exposed rock and coral heads in bright, well-flushed water, and it expects the same in captivity: a high, well-lit, high-flow position on solid rock. Provide intense reef lighting (roughly 200-350 PAR) and strong, turbulent flow that keeps the tentacles streaming. It is unforgiving of instability and poor water: keep SG ~1.025, 76-80°F, pH 8.1-8.4, undetectable ammonia and nitrite, and very low nitrate and phosphate, all held rock-steady. Add it only to a thoroughly mature, high-end reef system.

Substrate

Anchors its foot to solid live rock, typically high in the aquascape in bright open water—not in sand. Provide a stable rock perch in the light-and-flow sweet spot; it will not thrive seated in shaded low areas or buried in substrate.

Equipment & setup

Demands high-output reef lighting with strong PAR, powerful turbulent flow from multiple powerheads, a robust protein skimmer, and a mature, pristine system, ideally with controllers maintaining stable parameters. Screen every powerhead and overflow intake to protect a roaming anemone.

Diet

Strongly photosynthetic, relying on intense light to power its zooxanthellae for most of its nutrition. Supplement with target feeding of meaty foods—mysis, chopped shrimp, krill, silversides, or fish—roughly weekly, more often for newly imported or thin specimens. Adequate light is more important to its survival than feeding; a poorly lit ritteri will starve regardless of feeding.

Behavior & temperament

A solitary organism that does not readily clone in captivity. It anchors its foot to rock and prefers to stay put once settled high in the light and flow, but a stressed individual will detach and wander. It stings corals and other anemones, so reserve a clear, brightly lit zone for it. It is a top-tier host, accepting many clownfish species including percula, ocellaris, clark's, and others. Its survival rate is notoriously poor when light, flow, or water quality fall short.

Health

This species is prone to rapid decline if conditions are imperfect. A detaching foot, deflation, gaping mouth, or shrinking disc are early warnings; a disintegrating column, expelled unretracting guts, or foul odor mean a dying anemone to remove immediately before it crashes the tank. Bleaching (turning white) from inadequate light is common and frequently fatal. Buy only fully colored, firmly attached, actively feeding specimens, and guard all pump intakes against a wandering animal.

Tips, DIY & hacks

Only attempt this species in an established, high-light, high-flow reef, and refuse any specimen that is bleached, deflated, or not gripping rock firmly. Acclimate carefully to intense lighting to avoid further bleaching, and place it high in the tank. Avoid recently imported animals that have been kept dark and unfed during shipping.

Sources

  1. Heteractis magnifica — World Register of Marine Species (WoRMS) (reference)
  2. Magnificent (Ritteri) Anemone Care (hobby guide)
  3. Wikipedia: Magnificent anemone (wiki)