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

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
| Size | Oral disc commonly 12-20 in (30-50 cm), reaching over 3 ft (1 m) in the wild; among the largest host anemones. |
| Lifespan | 10–100 years |
| Social needs | solo |
| Native region | Indo-Pacific |
| Origin | Old World |
| Climate | 🌴 Tropical |
| Water type | 🌊 Marine |
| Family | Stichodactylidae |
| Genus | Heteractis |
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.
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.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
representativePurple base →
Wild form with a vivid purple column and contrasting tentacles; among the most sought-after color forms.
representativeGreen/tan tentacle forms →
Specimens with green or tan tentacles over colored columns (blue, red, or magenta), reflecting natural geographic color variation.
representativeStandard Tan / Brown Magnifica →
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.
representativeGreen Magnifica →
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.
representativePurple-Base (Purple Foot) Magnifica →
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.
representativeRed / Rose Magnifica →
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.
representativeBlue / Teal Tentacle Magnifica →
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.
representativeYellow / Gold Magnifica →
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.
representativePurple-Base Magnificent Anemone →
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.
representativeGreen Magnificent Anemone →
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.
representativeRed / Maroon Base Magnificent Anemone →
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.
representativeRainbow / Multicolor Magnificent Anemone →
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.
representativePurple Tip Ritteri →
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.
representativeGreen Tip Ritteri (Purple Base) →
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.
representativeYellow Tip Ritteri →
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.
representativeRed-Tipped Ritteri →
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.
representativeRed / Red-Magenta Base Rainbow Ritteri →
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.
representativeStarry Night Ritteri →
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.
Habitat & enclosure
Substrate
Equipment & setup
Diet
Behavior & temperament
Health
Tips, DIY & hacks
Sources
- Heteractis magnifica — World Register of Marine Species (WoRMS) (reference)
- Magnificent (Ritteri) Anemone Care (hobby guide)
- Wikipedia: Magnificent anemone (wiki)