Zoanthids
Zoanthids are colonial soft corals belonging to the order Zoantharia, known for their vibrant, often strikingly patterned colors and hardy, fast-growing nature, forming dense mat-like colonies made up of numerous small, closely connected polyps. Because zoanthids generally tolerate a wider range of tank conditions and lighting levels than many demanding SPS corals, they’ve become a popular, accessible choice for reef keepers spanning the full range of experience levels.
Zoanthid colonies spread by budding new polyps outward across available substrate, gradually forming an expanding, colorful mat that many reef keepers particularly value for covering rockwork.
Why It’s Important
- Known for vibrant, often strikingly patterned coloration.
- Hardy and forgiving, tolerating a wider range of tank conditions than SPS corals.
- Forms fast-spreading colonies well suited to covering rockwork.
- Popular and accessible for both beginner and experienced reef keepers.
How It Works
Zoanthid polyps extend during the day to capture light for their symbiotic zooxanthellae while also opportunistically capturing fine particulate matter drifting past, contributing modestly to their overall nutrition alongside photosynthesis. Colonies expand through budding, gradually producing genetically identical new polyps that spread outward across suitable rock surfaces over time.
Because zoanthid coloration often intensifies under specific lighting spectrums, many reef keepers experiment with lighting adjustments to bring out particularly vivid colors within a given colony.
Zoanthids and Related Concepts
Zoanthids are closely tied to soft coral as the broader category they belong to, and to palytoxin, a naturally occurring toxin some species can produce that warrants careful handling during frag work. They’re also relevant to coral frag and coral coloration, common reasons reef keepers propagate and select zoanthid colonies.
Reef keepers should always wear gloves when handling zoanthids directly, given the potential presence of palytoxin, which can pose a genuine health risk if it contacts skin, eyes, or is inhaled during fragging.
Zoanthid coloration and pattern varieties are numerous and often traded under distinctive named morphs, making them a popular category for collectors seeking specific, sought-after color combinations.
Pest issues like zoanthid-eating spiders or nudibranchs occasionally affect colonies, making regular visual inspection a useful habit for catching problems before they spread significantly.
Reef keepers fragging zoanthids should also work in a well-ventilated area and avoid boiling water during cutting or cleaning, since heating tissue containing palytoxin can release harmful airborne particles.
Beyond safety considerations, zoanthids are also a favorite among reef keepers for frag trading and swapping, since their fast growth and hardy nature make them easy to propagate and share within the hobbyist community.
Common Misconception
A common misconception is that zoanthids are entirely harmless to handle since they’re a hardy, beginner-friendly coral. In reality, some species can produce palytoxin, a genuinely dangerous toxin, making gloves and careful handling important safety practices during any direct contact or frag work.
The Bottom Line
Zoanthids are hardy, colorful colonial soft corals that form fast-spreading mats across rockwork. Popular and accessible for reef keepers of all experience levels, they still warrant careful, glove-protected handling due to potential toxin presence.
