Why is my Magnificent Anemone wandering around the tank?

Wandering is a clear sign that the anemone is unhappy with its current location. This is usually due to insufficient lighting, inadequate water flow, or fluctuating water parameters. They will move until they find optimal conditions, which puts them at high risk of getting caught in powerheads.

Does my anemone need a clownfish to survive?

No. While the symbiotic relationship is fascinating and beneficial, the anemone is perfectly capable of surviving and thriving without a resident clownfish, provided its lighting and feeding requirements are met.

How do I stop my anemone from being sucked into the powerhead?

You must physically guard all pump intakes. Use specialized 3D-printed anemone guards, foam sleeves, or fine mesh over the powerheads. An unprotected powerhead is almost guaranteed to shred a wandering anemone, which can crash the entire tank's ecosystem.

Why does my anemone have a gaping mouth?

A loose, gaping mouth, especially if the anemone is deflated or expelling a stringy brown substance, is a sign of severe stress or bacterial infection. If it persists for more than a day, it indicates poor health, often related to shipping trauma or poor water quality.

How long should a tank be established before adding a Ritteri Anemone?

Your aquarium should be fully mature and completely stable for at least 6 to 12 months before considering a Magnificent Anemone. They tolerate zero fluctuations in temperature, salinity, or nutrient spikes.

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Magnificent Anemone

Heteractis magnifica

The Magnificent Anemone is a spectacular but demanding marine invertebrate renowned for its vibrant, contrasting column colours and quintessential clownfish-hosting abilities.

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Ideal Conditions

Temperature: 24 – 28 °C
pH range: 8.1 – 8.4
Hardness: 14 – 22 dGH
Salinity: 1.024 – 1.026 SG
Adult size: 30 – 60 cm
Minimum volume for an adult: 400 litres+
Lifespan: 10 – 50 years
Diet: Carnivore and Photosynthetic
Water flow: Strong and turbulent
Preferred setup: Smooth, elevated rockwork exposed to high light and strong flow

About the Magnificent Anemone

Heteractis magnifica, widely known in the hobby as the Ritteri Anemone, is among the most impressive and massive anemones available to reefkeepers. In the wild, they can grow to a metre in diameter, though they usually remain under 60 cm in captivity. They are distinguished by their brilliantly coloured columns, which can be striking shades of purple, magenta, red, or green, topped with thousands of finger-like tentacles. Due to their immense size and extremely specific care requirements, they are recommended only for experienced marine aquarists.

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Is it right for your tank?

Check Magnificent Anemone against a habitat you already keep. We compare water type, temperature, pH, adult size, group needs and everything living there.

Where Magnificent Anemone comes from

Native range

Indo-Pacific, Red Sea, Great Barrier Reef

Countries / regions

Australia, Indonesia, Philippines, Egypt

Habitat

Exposed reef crests, outer reef slopes, and areas with strong, surging water movement.

Found in both shallow waters subject to intense sunlight and slightly deeper reef slopes with strong currents.

Similar species

Bubble Tip Anemone
Entacmaea quadricolor
Sebae Anemone
Heteractis crispa
Carpet Anemone
Stichodactyla haddoni

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Ocellaris Clownfish
Amphiprion ocellaris
Naturally forms a symbiotic relationship with this anemone, providing the fish with shelter and the anemone with food scraps.
Great
Percula Clownfish
Amphiprion percula
Another highly compatible natural host species that will readily accept the anemone and help defend it.
Great
Small Gobies and Blennies
If they accidentally blunder into the anemone's potent tentacles, they can be stung and consumed.
Compatible with caution
SPS and LPS Corals
A wandering anemone will heavily sting and likely kill any corals it touches on its way to finding a permanent spot.
Compatible with caution
Raccoon Butterflyfish
Chaetodon lunula
Known to pick at and eat anemone tentacles, causing severe stress or death to the invertebrate.
Not recommended

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