Sunny D Zoa Care Guide
A bright orange-yellow Zoanthus morph with a green center; a hardy, photosynthetic encrusting zoanthid suited to reef aquariums.
Compiled by Aquairi from published sources · Published · Updated
Overview
Sunny D Zoa is a named color morph of Zoanthus, a colonial zoanthid in the family Zoanthidae. The morph shows a bright orange-yellow skirt with a green center. Zoanthids form colonies of small polyps that spread across rock as an encrusting mat and are commonly called zoas or button polyps. They are hardy and tolerant of parameter fluctuations.
Taxonomy
- Phylum: Cnidaria; Class: Anthozoa (Hexacorallia); Order: Zoantharia
- Family: Zoanthidae
- Genus: Zoanthus Lamarck, 1801
- Scientific name: Zoanthus sp. 'Sunny D' (aquacultured designer morph)
Biology
Zoanthus is a zooxanthellate genus: the polyps host symbiotic algae (zooxanthellae) and obtain most of their energy from photosynthesis, supplemented by capturing fine food particles with their tentacles. Polyps are connected by shared tissue and reproduce asexually by budding, allowing a colony to spread over a rock surface.
Tank requirements
- Salinity: 1.024-1.026
- Temperature: 24-26 °C (75-79 °F)
- pH: 8.1-8.4
- Alkalinity (dKH): 8-11
- Calcium: 380-450 ppm
- Magnesium: 1280-1350 ppm
- Nitrate: below ~15 ppm; Phosphate: below ~0.1 ppm
- Lighting: medium, around 50-150 PAR
- Flow: low to moderate (enough to keep detritus off the polyps)
- Minimum tank maturity: about 3 months
Care and placement
Zoanthids tolerate a range of lighting spectrums and intensities; medium light suits this morph. They benefit from moderate flow, since low-flow areas allow detritus and algae films to settle on the polyps. They are peaceful and reef-safe with other corals, fish and invertebrates. As an encrusting coral it spreads across the rock over time.
Feeding
The colony is primarily photosynthetic through its zooxanthellae. Optional target feeding with fine foods such as phytoplankton or zooplankton, roughly twice a week, can support growth, but is not strictly required.
Sunny D Zoa: Propagation Guide
Overview
Sunny D is a bright orange-yellow Zoanthus morph (family Zoanthidae) with a green center. Like other named zoas, it is a hobby color selection of these colonial button polyps rather than a separate species. Within a colony the polyps remain joined by a stolon, or coenenchyme mat, and Zoanthus is recognized for producing a large number of distinct color morphs of the same or similar species.
Reproductive Mode
Propagation in aquaria is asexual. Colonies form because offspring polyps stay attached to the parent by a fleshy stolon, and the mat buds new polyps outward across the rock. This stolon budding is how a Sunny D colony naturally expands, without any sexual spawning.
Fragging / Asexual Propagation
- Choose the polyps to remove and slice the connecting stolon mat with a sharp razor blade.
- Follow the score line with coral cutters so the piece detaches; a diamond band saw handles thick rock bases.
- Soak and dry a frag plug or rubble, dry the frag base, and apply a little cyanoacrylate glue.
- Press the frag onto the plug, hold briefly to cure, then place it back in the tank.
- New tissue and polyps confirm the frag has taken.
Conditions for Propagation
Zoanthus are among the easiest corals to keep, tolerating lighting from lower to higher levels over roughly an 8 to 12 hour photoperiod. Healing frags prefer moderate to higher flow so the polyps are fed and waste is removed. As the stolon spreads, grouped frags merge into a colorful mat.
Palytoxin Safety
Zoanthids can carry palytoxin, one of the most poisonous non-protein substances known. Wear gloves and eye protection during fragging, keep your hands off your face, and wash thoroughly afterward. Never boil, heat, or scrape the rock, as heating can aerosolize the toxin for inhalation. There is no antidote; only symptoms can be managed.
Common Challenges
Freshly cut polyps may stay closed for several days while healing; consistent chemistry and gentle flow assist recovery. The bright orange-yellow tone of Sunny D depends on lighting and water quality, fading under poor conditions. The greatest challenge is handling palytoxin safely rather than the cut itself.