Why are my Green Star Polyps not opening?

GSP can be temperamental and may close for several days due to changes in water flow, lighting, or minor parameter shifts. Ensure there is no detritus or nuisance algae settling on the purple mat; gently blowing it off with a turkey baster often encourages them to reopen.

How do I stop Green Star Polyps from spreading too much?

The most effective method is physical isolation. Place your GSP on a standalone rock surrounded by the sandbed. The coral will encrust the rock entirely but generally will not grow across the loose substrate.

Do Green Star Polyps need to be fed?

No direct feeding is required. They derive the vast majority of their nutrition from your aquarium lighting via their symbiotic zooxanthellae, though they will also naturally absorb dissolved nutrients from the water column.

Can I keep Green Star Polyps with clownfish?

Yes, it is very common for clownfish to adopt a large, established patch of Green Star Polyps as a surrogate host if an anemone is not present. The coral typically tolerates this behaviour remarkably well.

How do I frag Green Star Polyps?

Fragging GSP is extremely simple. Use a sharp scalpel or aquarium scissors to cut a section of the purple rubbery mat, or peel it carefully off a smooth surface like glass. Use coral glue (cyanoacrylate) to stick the bare underside of the fragment onto a new frag plug or piece of rubble.

MarineCoralsBeginner

Green Star Polyps

Briareum violaceum

Green Star Polyps (GSP) are incredibly hardy, fast-growing soft corals famous for their glowing neon green fluorescence and carpet-like growth, making them an undisputed favourite for beginner marine aquarists.

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Ideal Conditions

Temperature: 24 – 27 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.023 – 1.026 SG
Adult size: 10 – 100 cm
Nano Reef: 30 litres+
Lifespan: 5 – 50 years
Diet: Photosynthetic
Water flow: Moderate to High
Preferred setup: Place on an isolated rock island to prevent it from overgrowing the main reef structure.

About the Green Star Polyps

Briareum violaceum, universally known in the hobby as Green Star Polyps, is one of the most recognisable and forgiving soft corals available. They grow from a distinct purple, rubbery mat (the stolon), from which eight-tentacled, daisy-like polyps emerge. Under heavy actinic blue lighting, these polyps display an intense, glowing neon green colouration. While highly sought after for their striking appearance and indestructible nature, their rapid, encrusting growth means they can quickly conquer a reef if left unchecked.

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Is it right for your tank?

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Where Green Star Polyps comes from

Native range

Indo-Pacific

Countries / regions

Indonesia, Australia, Philippines, Fiji

Habitat

Coral reefs, reef slopes, and shallow sunlit lagoons with moderate flow.

Widespread across shallow, well-lit Indo-Pacific coral reef ecosystems.

Similar species

Clove Polyps
Clavularia spp.
Pulsing Xenia
Xenia spp.
Pipe Organ Coral
Tubipora musica

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

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

View all compatibility

Ocellaris Clownfish
Amphiprion ocellaris
Clownfish will often use a large colony of Green Star Polyps as a surrogate host, and the coral is robust enough to handle the interaction without distress.
Great
Hermit Crabs
Paguroidea
Small, reef-safe hermit crabs act as an excellent clean-up crew, helping to keep the coral's mat free of settling detritus and nuisance algae.
Great
Small Polyp Stony (SPS) Corals
Acropora spp.
GSP grows incredibly fast and can quickly encrust over the bases of slower-growing SPS corals, smothering them if not kept physically separated.
Compatible with caution
Peppermint Shrimp
Lysmata wurdemanni
While generally considered reef-safe, some Peppermint Shrimp have been known to irritate or pick at the fleshy polyps of soft corals.
Compatible with caution
Dwarf Angelfish
Centropyge spp.
Many dwarf angelfish species are prone to repeatedly nipping at soft, fleshy polyps, which will cause the Green Star Polyps to remain permanently retracted.
Not recommended

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