Why is my Green Slimer producing so much slime?

This is a natural stress response to being moved, exposed to air, or suddenly experiencing changes in flow or chemistry. As long as parameters are stable, the slime will dissipate within a few hours.

How fast does Acropora yongei grow?

Under ideal conditions with high light and stable calcium/alkalinity, it is one of the fastest-growing SPS corals, capable of adding several inches of new branch growth per year.

Does it need to be fed?

While not strictly necessary due to its photosynthetic zooxanthellae, feeding small micron-sized zooplankton and amino acids will noticeably improve both growth speed and polyp extension.

Why has my Green Slimer turned brown?

Browning is typically a sign of insufficient lighting or elevated nutrients (nitrates/phosphates) causing an overpopulation of zooxanthellae. Gradually increasing light intensity or improving water quality will usually restore its bright green colour.

Where is the best place to position it in my aquarium?

Place it in the middle to upper third of your rockwork where it will receive intense lighting and strong, turbulent water flow.

MarineCoralsIntermediate

Green Slimer Acropora

Acropora yongei

The Green Slimer Acropora is a vibrant, fast-growing small polyp stony (SPS) coral, celebrated as one of the best entry-level choices for reef keepers venturing into the world of Acroporidae.

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Ideal Conditions

Temperature: 24 – 27 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.024 – 1.026 SG
Adult size: 15 – 50 cm
Suitable for medium to large established reef aquariums: 150 litres+
Lifespan: 10 – 50 years
Diet: Photosynthetic via symbiotic zooxanthellae; benefits from amino acids and microplankton target feeding.
Water flow: High, turbulent flow is essential to keep branches clear of detritus and deliver nutrients.

About the Green Slimer Acropora

Instantly recognisable by its vivid, fluorescent green colouration and arborescent growth pattern, the Green Slimer earns its common name from a unique defence mechanism. When handled, exposed to air, or stressed, the coral exudes a thick, highly visible mucus coating to protect its delicate tissues. Despite this dramatic reaction, it is remarkably resilient compared to its more sensitive relatives, making it an enduring favourite in the reefing hobby.

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Is it right for your tank?

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Where Green Slimer Acropora comes from

Native range

Indo-Pacific, Red Sea, Coral Triangle

Countries / regions

Australia, Indonesia, Philippines, Fiji

Habitat

Shallow reef slopes and upper reef margins exposed to strong wave action and intense sunlight.

Widespread across the Indo-Pacific, typically found in shallow, high-energy reef environments.

Similar species

Staghorn Acropora
Acropora cervicornis
Birdsnest Coral
Seriatopora hystrix
Bali Tricolour Acropora
Acropora sp.

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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Yellow Tang
Zebrasoma flavescens
An excellent herbivore that will tirelessly graze on nuisance algae, preventing it from smothering the coral's base.
Great
Six Line Wrasse
Pseudocheilinus hexataenia
An active hunter that naturally controls populations of flatworms and other pests that might stress Acropora.
Great
Clown Goby
Gobiodon okinawae
While generally reef-safe, they are known to perch on and sometimes nip at Acropora polyps, occasionally laying eggs on the branches which causes localized tissue recession.
Compatible with caution
Raccoon Butterflyfish
Chaetodon lunula
Not reef-safe; will actively predate on SPS polyps and can quickly strip the coral of its living tissue.
Not recommended

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