Green Star Polyp (Briareum cf. hamrum)

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Green Star Polyp
Briareum cf. hamrum
Green Star Polyp (Briareum cf. hamrum)
Name Green Star Polyp
Name Lat. Briareum cf. hamrum
Family Briareidae
Family lat. Briareidae
Order Soft Corals
Order lat. Alcyonacea
Origin Indo-Pacific
Diet Autotrophic, planktivore
pH 8.1-8.4
Hardness 6-10 °KH
Lighting Medium - high
Current Moderate - strong
Behavior Peaceful
Keeping Colony
Care Level Easy
Life Span N/A
Protection No
Metric Units
Size < 60 cm
Temperature 23-28 °C
Salinity 33-36 ‰
Aquarium 180 l
US Units
Size < 24"
Temperature 73-82 °F
Salinity 1.020-1.025 sg
Aquarium 50 gal

Distribution and habitat

The distribution area of Briareum cf. hamrum is the tropical Indo-Pacific, where they occur from the Philippines to Indonesia and Australia. They live mostly on inner reefs and in the shallow water of well flowed lagoons and often form large colonies.


They should be positioned in the middle or upper area, in a location with medium to high light intensity and moderate to strong, alternating current

Only high-calcium, heavy metal-free substrates should be used as substrate. Filters, skimmers and heaters are necessary to ensure water quality, as well as pumps to simulate tides, swells and bottom currents. It is recommended that live stones be used to set up the aquarium. The bacteria living in the porous stones act as a biological filter. The lighting must correspond to the species-appropriate day-night rhythm of the animals

Salinity: 33-36 ‰ pH value: 8.1-8.4
Carbonate hardness: 6-10 °KH Nitrate content: 2-8 mg/l
calcium content: 400-450 mg/l Nitrite content: 0.0-0.05 mg/l
Magnesium content: 1.250-1.350 mg/l phosphate content: 0.01-0.1 mg/l

Regular addition of trace elements, especially iodine, is recommended. For salinity, an average value should be aimed for, which may only vary slightly by +/- 0.5 ‰. Ammonia and ammonium must not be measurable. Special attention shall be paid to consistently good water quality and water values.


Zooxanthellae, which are unicellular symbiotic algae, live in their tissue and provide them with assimilation products of their photosynthesis (high light requirement). The zooxanthellae promote growth and provide additional food to the plankton and small particles collected from the water current. In addition to the food produced in the aquarium during fish feeding (mysis, krill, artemia, etc.), commercial food for lower animals in the form of phyto- and zooplankton, frozen or liquid, should be offered regularly

Regular and varied feeding promotes health and increases resistance.

Behaviour and compatibility

They live in colonies, their growth is branched and creeping and they can be well socialized with fish that do not consider them food. A sufficient distance must be kept to other corals in order not to restrict their growth and to avoid nettling.

Reproduction and breeding

Their asexual reproduction occurs through the formation of daughter colonies (budding). In the aquarium it can be propagated well by fragmentation (cutting off parts of tissue). The fragment is fixed on a piece of living rock, to which it grows firmly after a few weeks.


The additional illumination with actinic light (short-wave, violet-blue light) is very beneficial for their growth (zooxanthellae).

For the necessary uniform supply of calcium carbonate and magnesium, a calcium reactor and a magnesium metering pump are recommended.

If different species are kept together, care should be taken to ensure that fish and invertebrates match each other in terms of water quality and temperature requirements, as well as their social behavior, and that the setup meets the ecological needs of all species kept together. Newly introduced animals must be acclimated slowly to the water in the aquarium.

Further literature can be found in your pet store.


Text: petdata; Image: Franz Lowak

Source: KNOP (2013): Lexikon der Meeresaquaristik, Natur und Tier Verlag; ENGELMANN & LANGE (Hrsg.) 2011: Zootierhaltung - Tiere in menschlicher Obhut: Wirbellose, Verlag Harri Deutsch