Candy Apple Red

Candy Apple Red is one of the classic named zoanthids of the modern hobby, a Zoanthus morph traded for years under its own name and its short form, CARs. The look the name promises is specific: a bright red oral disc, a green skirt around the edge, and a dark centre at the mouth, so a settled colony reads like a row of small red-and-green apples on the rock. When a frag arrives brown, plain green, or missing the red altogether, keepers are right to question whether they received this morph at all — that complaint runs through the older keeper record for this name (see field notes).

On taxonomy, honesty matters more than a tidy label. A widely read zoanthid identification guide files Candy Apple Red among the variety names carried by the Zoanthus pulchellus and Zoanthus vietnamensis pair — two look-alike species, one Caribbean and one Indo-Pacific, whose polyps are a few millimetres across with red, pink, or purple oral discs that often carry a radial pattern. Hobby material is almost never identified to species, so this entry stays at Zoanthus sp., with the guide's grouping noted here for keepers who want to dig deeper.

Care is standard zoanthid care with one emphasis: protect the red. Vendor guidance written for this morph puts it in moderate light, roughly 80–150 PAR, with some balanced spectrum rather than an all-blue mix, and warns that the red fades when light is too intense or nutrients are stripped to zero. Start a new frag low, acclimate it upward slowly over a few weeks, and keep nitrates and phosphates low but detectable. Reef To Go's standard reef parameters suit it: 77–79°F, salinity near 35 ppt (about 1.024–1.026), alkalinity 8–10 dKH, calcium 400–450 ppm.

Flow should be moderate and indirect — enough to keep the mat clean and stop detritus settling between polyps, not so direct that the colony stays shut. Polyps that stretch and lean are usually asking for a little more diffuse light or less one-directional current. The coral is photosynthetic and needs no feeding, but fine-particle coral foods offered occasionally are taken and support colour and growth in vendor and keeper practice.

Give the colony room on its own rock or a defined garden area. Zoanthids sit peacefully against other zoanthids, which is how mixed zoa gardens are built, but a healthy mat will keep spreading, and neighbours with sweeper tentacles should stay out of reach. Fragging is the usual mat cut between polyps; take frags only from consistently coloured, mature polyps if the red-and-green pattern is to carry over, and let fresh frags heal in moderate light and flow before moving them.

Safety applies to this coral as it does to zoanthids generally. Some zoanthids and their Palythoa relatives can carry palytoxin, and there is no visual way to tell which colonies do. Handle and frag with gloves and eye protection, keep the coral away from open cuts, wash thoroughly afterwards, and never boil, steam, or pressure-wash rock that carries it, because heat can aerosolize the toxin. Handled with that respect, a settled colony is a routine, hardy aquarium coral.

Field notes — what keepers report

- The name itself is the biggest field-notes theme. In a long 2013 Reef Central thread about a budget vendor's zoanthids, one keeper described the pictured candy apples as a bright red centre with a green skirt and a dark dot in the middle, then reported that what arrived was brownish in both disc and skirt; another reported a cheap five-polyp order that arrived plain green with no red at all, while a third keeper in the same thread said a four-polyp candy apple frag from the same vendor was a good size and well worth the price. Read together, the reports point to a name that was being applied loosely at the cheap end of the market, and to colour that depends on the receiving tank — not to proof that any one report was wrong.

- Colour loss in an established tank is the complaint vendor guidance for this morph answers directly: reds are reported to dull under overly intense or overly blue-heavy light and in ultra-low-nutrient water, and to recover over a few weeks when intensity is eased and nutrients are kept detectable. That lines up with the general keeper experience that red zoanthid morphs are a light-and-nutrient balancing act rather than a set-and-forget colour.

- Stretching is reported as a shape problem rather than a health emergency for this morph: colonies that grow but lean and elongate are generally read as short on diffuse light or sitting in one-directional flow, and they return to a compact shape when light is nudged up and flow is made more random. Crowded, self-shading mats push polyps upward too.

- Predation reports single this morph out by name at least once: in a Reef2Reef thread about a vanishing Exosphere colony, a keeper reported having lost a colony of candy apples outright and starting to lose a Candy Apple Red colony while other zoanthids in the same tank were fine, with small asterina starfish present throughout. Other keepers in that thread caution that many asterina types are harmless and only some graze zoanthids, so the honest reading is suspicion, not a verdict — inspect a declining colony at night and look for what is actually on it before treating.

- Sudden decline ("melt") and zoa pox are the risks keepers and vendor care pages raise for zoanthids as a group, with this morph named in vendor guidance on the topic: stability, good flow, keeping the mat basted clean, and nightly checks for nudibranchs and their eggs are the prevention side keepers agree on. Strain-specific melt data for Candy Apple Red was not found in the sources read, so this entry does not claim the morph is unusually melt-prone.

- Price spread in listings actually read is wide and reinforces the naming caution above: a current Top Shelf Aquatics cut-to-order listing prices a one-polyp frag at $69.99 (shown out of stock when read), an AquaSD flash-sale post listed Candy Apple Red Zoanthids at $20, and the 2013 thread discussed five-polyp offers under $10 that keepers themselves doubted were the true morph. A low price on this name is not, by itself, evidence of the real strain.