
Source: Wikimedia Commons
Goniastrea retiformis
A merulinid reef coral whose small polygonal corallites share walls and pack tightly together. Known as the lesser star coral, it lives in shallow Indo-Pacific water and tolerates the strong light and wave action of the reef flat.
Goniastrea retiformis is a reef-building merulinid coral of shallow Indo-Pacific waters, known in English as the lesser star coral. Lamarck described it as Astraea retiformis in 1816, and it was later moved to Goniastrea. Colonies grow as hemispheres, domes or columns, and the skeleton is a close network of small polygonal corallites that share their walls. The small, regular corallites are what separate it from other genera in the family. It lives mainly on reef flats and other shallow, brightly lit, wave-washed ground, and the IUCN rates it Least Concern. In the aquarium it tolerates moderate to fairly strong light and is stable under moderate flow. Growth is slow but the coral is hardy, and it is among the easier stony corals to keep long term once water chemistry is steady. As a scleractinian it is on CITES Appendix II.
Source: Wikipedia (CC BY-SA 4.0)
The ideal temperature for the Goniastrea Retiformis is 24〜27℃.
Origin
Shallow water across the Indo-Pacific
Size
Colonies to several tens of cm
Temperature
24〜27℃
Mainly nutrition from symbiotic zooxanthellae, supplemented with meaty coral foods offered at night.
Sources: LiveAquaria / AlgaeBarn: Calcium Supplementation / WoRMS (World Register of Marine Species)
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Goniastrea retiformis (Lamarck, 1816)
Synonyms: Astraea retiformis Lamarck, 1816, Astraea (Fissicella) eximia Dana, 1846, Astraea spongia Hemprich & Ehrenberg, 1834
Authority databases: WoRMS
Nomenclature follows global taxonomic authority databases.
Sources: CITES Appendix II (Scleractinia spp. listed as an order) / IUCN Red List
Regulations may change. Always verify the latest information with the relevant authorities.
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A reef-flat species that tolerates moderate to fairly strong light, but reduce the light for newly added colonies and raise it over several weeks.
Medium flow. It can sit anywhere from the sand bed to mid-height, but leave space, because tissue recedes where the skeleton edge touches a neighbouring coral.
Water 24-26C, specific gravity 1.023-1.025, salinity 33-35 ppt, KH 8-12. It consumes calcium and magnesium, so test and replenish them regularly.
Most of its nutrition comes from its zooxanthellae. The corallites are small and cannot take large items, so feed powdered or finely particulate coral food after lights-out.
Growth is slow, and tissue recedes readily after sudden water-chemistry swings or prolonged high temperatures. As a scleractinian it is on CITES Appendix II and international trade requires permits.
Beginner. This is a beginner-friendly species. No special equipment or experience is required, and it can be kept successfully with basic care setup.
The ideal temperature for Goniastrea Retiformis is 24〜27℃. Avoid sudden temperature changes and maintain a stable environment.
Goniastrea Retiformis feeds on: Mainly nutrition from symbiotic zooxanthellae, supplemented with meaty coral foods offered at night.. Aim for a balanced diet with appropriate feeding frequency.
The price of Goniastrea Retiformis varies significantly depending on variety, size, and individual quality. Check our market price page for the latest pricing information.
Last updated: September 16, 2026