Sinularia dura, also known as the Cabbage Leather Coral, is a hardy soft coral that gets its common name because it grows on short stalks, close to the rock, with large fleshy lobes that are shaped somewhat like the leaves of a plant, like cabbage. The color is generally between pink and brown, although blue and neon green highlights are color morphs that are available.
Coloration in corals can change based on the specific lighting configuration they are kept under. This is due to a combination of pigments in the coral tissue and the presence of symbiotic zooxanthellae. Under higher intensity blue or actinic lighting, Sinularia dura may display more vivid green or blue hues, while under lower light or less blue spectrum, the coral may appear more brown or muted. Adjusting the spectrum and intensity can help enhance certain colors, but the range is limited by the coral’s genetics. If you’re aiming for brighter greens or blues, try gradually increasing blue spectrum lighting while monitoring for signs of stress.
Let’s dive deeper into the world of Sinularia dura, the Cabbage Leather Coral.
Care requirements in a saltwater aquarium
Typical aquarium conditions are all that the cabbage leather coral needs to thrive. This hardiness is due in part to its tough, leathery tissue and the presence of numerous bony sclerites—tiny, supportive structures embedded within the coral’s body. These features help Sinularia dura tolerate a wider range of water parameters and physical conditions than many other corals. However, while it is forgiving, stability remains important for long-term health. Even hardy corals can suffer from frequent or dramatic parameter swings.
- Recommended temperature: 73-84 degrees Fahrenheit, 22.8 to 28.9 Celsius (stable, not fluctuating)
- Specific gravity: 1.025
- Lighting: Low to moderate
- Water flow: Low to moderate
- pH: ~8.1-8.4 (stable, not fluctuating)
- Hardness: 8-12 dKH (again, stable, not changing frequently)
Sinularia dura’s resilience is notable even among soft corals. Compared to toadstool leather (Sarcophyton) or Kenya tree (Capnella), Cabbage Leather Coral is similarly tolerant of less-than-ideal conditions, but it is not immune to stress. Signs of trouble from parameter instability include drooping, excessive slime production, tissue recession, or failure to expand. If a “hardy” coral begins to decline, consider hidden issues such as allelopathy from neighboring corals, dead spots in water flow, or cumulative effects of minor parameter swings. Regular monitoring and prompt correction of water quality are still essential for long-term success.
This is just a brief overview of the appropriate water parameters. For a more in-depth look, check out this article:
The 9 most important reef tank water parameters
Unlike the polyps from some other leather corals, like the toadstool leather coral, the small polyps of Sinularia dura are able to capture prey and would benefit from the occasional feeding of Reef Roids, baby brine shrimp, or cyclops. Supplemental feeding can enhance growth and coloration, as the coral’s polyps are adapted to trap fine particulate foods. However, increased feeding may raise nutrient levels (nitrate, phosphate), potentially fueling nuisance algae if not managed. To balance benefits and risks, feed sparingly—once every week or two—and ensure your tank’s nutrient export (via skimming, water changes, or refugium) keeps up with any added food. Feeding is beneficial but not strictly required for survival.
Anatomy and Structure
Sinularia dura is an octocoral, meaning each polyp has 8 tentacles. All soft corals, including cabbage leather, have bony structures called sclerites in their bodies—these look like tiny bony fingernail clippings and provide basic support for the coral’s flesh. The relatively tough body and abundance of sclerites help this species withstand strong currents and variable conditions in both nature and the aquarium. The polyps are small but capable of capturing fine prey, contributing to the coral’s adaptability.
Natural habitat
The natural range for the cabbage leather coral is widespread throughout the Indian and Pacific Oceans and the Red Sea, often in shallow water reef areas with strong currents, in which this soft coral thrives, because it has a relatively tough body and a lot of bony sclerites for support.
Take a look at this toxic mix–palytoxin producing palythoa and a terpene toting great cabbage patch
Compatibility
The cabbage leather coral is probably best kept with other leather corals, as well as zoanthid and mushroom coral species. Sinularia coral is known to be the most toxic of the leather coral species.
Sinularia species, including Sinularia dura, can engage in allelopathy—chemical warfare—by releasing compounds called terpenes into the water. These chemicals can inhibit or stunt the growth of stony corals (LPS and SPS), and sometimes even other soft corals. Symptoms of allelopathic stress in neighboring corals include tissue recession, polyp retraction, slowed growth, or unexplained decline. The risk and severity can vary by species and individual tank conditions, so “success” in one tank does not guarantee compatibility in another.
To mitigate these risks, consider the following strategies:
- Use activated carbon in your filtration system to help remove dissolved toxins.
- Increase water change frequency, especially after adding or fragging Sinularia.
- Physically separate Sinularia from sensitive corals, especially LPS and SPS, to minimize direct and indirect contact.
- Carefully monitor all corals for early signs of stress after introducing new specimens.
While the Borneman book, Aquarium Corals, highlights Sinularia flexibilis as the most toxic from this group, citing the release of terpenes, caution is advised when mixing any Sinularia with stony corals. Not all soft corals are equally safe with stony corals—Sinularia is among the more potent in chemical interactions. Although I have personally had success keeping them along with the Frogspawn coral, there is enough evidence of incompatibility that caution is certainly advised.
Reproduction and propagation
This sinularia coral was easy to frag
These corals are thought to reproduce by fragmentation or branch dropping, as well as having larger branches divide in two. They are not particularly fast-growing leather corals, but they do frag quite easily. However, attaching Sinularia frags can be tricky due to their soft, slimy tissue and tendency to produce mucus. Frags may slip out of rubber bands or mesh, or suffer tissue damage at the attachment point.
Common failure modes include:
- Tissue necrosis or rot at the attachment site
- Detachment from the substrate before healing
- Infection or excessive slime production
To improve success:
- Adjust the tension of rubber bands or use plastic mesh to gently hold the frag in place without cutting into tissue.
- Monitor closely for signs of rot or detachment, and reattach if needed.
- Maintain stable water parameters during recovery, as frags are more vulnerable to stress.
- Look for signs of healing: tissue growth over the substrate and polyp extension. If the frag shrivels, turns mushy, or detaches repeatedly, troubleshoot attachment method or check for water quality issues.
Frags are best attached to the substrate using a rubber band or plastic mesh methods, which are described in greater detail in How to Frag Corals.
Attachment of leather corals, like this Sinularia, can be tricky. The rubber band method ought to do the trick
Scientific name
The scientific name for the cabbage leather coral is Sinularia dura.
Other common names
You may see cabbage leather corals, Sinularia dura, listed under one of these other common names: carpet coral, flower leather coral, flat leather coral, leaf leather coral, lobed leather coral, scalloped leather coral.
Where to buy
Cabbage leather corals are a popular species and are available at most local and online aquarium stores. Since they are easy to frag, you may be able to save some money by trading for a frag or buying a frag from a fellow hobbyist in your area. Joining an aquarium club is a great way to meet other hobbyists and trade frags.
When acquiring Sinularia dura, especially from hobbyist trades, inspect frags carefully for pests such as flatworms or nudibranchs, and consider quarantining new additions before introducing them to your display tank. Mislabeling is also possible—confirm identification by looking for the characteristic cabbage-like lobes, short stalks, and the presence of small polyps with eight tentacles. If in doubt, consult a reputable reference or experienced hobbyist.
Take a look at the great neon green coloration of this Cabbage leather coral, Sinularia dura
For more information
Check out other great soft coral species:
If you’re looking for a great beginner coral, check out this article.
For more information about setting up a new saltwater aquarium with a great beginner coral, like the cabbage leather coral, check out The New Saltwater Aquarium Guide.
To learn tips and techniques to start fragging your own corals, check out How to Frag Corals.
References
Borneman, Eric H. Aquarium Corals. Microcosm Ltd; 1st Printing Edition (March 1, 2001)
Ulrich III, Albert B. How to Frag Corals: Step-by-step guide to coral propagation and filling your frag tank with thriving polyps. www.SaltwaterAquariumBlog.com (January 20, 2015).
Ulrich III, Albert B. The New Saltwater Aquarium Guide. www.SaltwaterAquariumBlog.com (April 8, 2014)