Magnificent Sea Anemone
Heteractis magnifica
What you need to keep a Magnificent Sea Anemone
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pH
8.1–8.4
Temperature
24–27 °C
Colony size
50 cm
Min tank
600 L
Where to buy
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Overview
What to know before you buy.
A large, brilliantly coloured host anemone that demands very intense lighting and pristine, mature water. Prone to wandering and getting into powerheads; a demanding animal despite how often it is sold.
Care guide
Keeping Magnificent Sea Anemone healthy in a South African setup.
Placement & light
An anemone chooses its own spot and will walk until it finds the light and flow it wants. Cover pump intakes and powerheads first, then let it settle.
Water parameters
Keep pH 8.1–8.4 and 24–27°C, with salinity around 1.025–1.026. Alkalinity, calcium and magnesium matter more than any single reading: keep them stable and test weekly.
Feeding
Photosynthetic plus meaty feeding. Most of its energy comes from light, so feeding supplements good lighting rather than replacing it.
Stinging & spacing
Mobile; strong sting. Many corals and anemones sting what they touch, some with sweeper tentacles that reach well beyond the colony at night. Leave clear space around Magnificent Sea Anemone as it grows.
Reef compatibility
Large angelfish and butterflyfish nip at corals and anemones; most reef fish, shrimp and snails leave it alone.
Propagation
Some anemones split on their own in a stable tank; they are not cut.
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