Description
Giant Polyp Gorgonia (Plexaurella sp.)
(Also known as the Giant Polyp Sea Fan or Rough Sea Rod Coral)
Overview
The Giant Polyp Gorgonia (Plexaurella sp.) is a striking photosynthetic soft coral known for its thick, upright branches and large, extended polyps that give it a textured, bushy appearance. Colours range from tan and golden-brown to purple or reddish-brown, often with contrasting white or cream polyps. This hardy and adaptable species adds natural structure and motion to reef aquariums, making it an excellent choice for aquarists seeking an attractive, active display coral.
Origin
Native to the Caribbean Sea, Western Atlantic, and Gulf of Mexico, commonly found in shallow reef slopes and coastal lagoons exposed to moderate current and bright light. The Plexaurella genus includes several species that differ slightly in colour and branching density but share similar care requirements.
Feeding
The Giant Polyp Gorgonia is primarily photosynthetic, containing zooxanthellae that provide most of its nutritional needs through photosynthesis. However, supplemental feeding supports growth and polyp extension:
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Phytoplankton or microplankton (2–3 times per week)
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Marine snow or coral micro foods
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Occasional dosing with amino acid or trace element supplements
Polyps feed passively from the water column, so direct target feeding is not necessary.
Lighting
Moderate to high lighting. Provide strong, full-spectrum light from LED, T5, or metal halide systems to support photosynthesis and vibrant coloration. PAR levels of 150–250 µmol/m²/s are ideal. Too little light will cause reduced polyp extension and fading.
Water Flow
Moderate to strong, indirect flow. Constant water movement helps keep the gorgonian clean and the polyps fully extended. Adequate flow prevents detritus buildup and encourages gas exchange, but avoid direct jets that could damage tissue.
Placement
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Mount the coral vertically or at an angle in the mid to upper regions of the tank where it receives light and flow from multiple directions.
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Allow space between colonies or other corals to prevent contact or shading.
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Can be attached securely to rockwork with coral glue or epoxy.
Tank Mates
Peaceful and reef safe. Compatible with:
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All reef-safe fish (gobies, blennies, tangs, clownfish, etc.)
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Cleaner shrimp, hermit crabs, snails, and other invertebrates
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Most corals, provided adequate spacing
Avoid:
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Angelfish, butterflyfish, or large wrasses that may nip at polyps
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Aggressive or stinging corals (e.g. Euphyllia, Galaxea, Hydnophora) nearby
Aggression
Peaceful. Does not sting or overgrow other corals but may release mild allelopathic compounds in overcrowded systems. Maintain space and use activated carbon or regular water changes in mixed reefs.
Experience Level
Beginner to intermediate. Hardy and adaptable, Plexaurella gorgonians are among the easier sea fans to keep. They tolerate a range of reef conditions and respond well to strong lighting and steady flow.
Water Parameters
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Temperature: 24–27°C (75–81°F)
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pH: 8.1–8.4
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Salinity: 1.024–1.026 SG
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Hardness (dKH): 8–12
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Calcium: 400–450 ppm
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Nitrate: <10 ppm
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Tank Size: Minimum 75 gallons (280L) for stability and good circulation
Maintain stable parameters and moderate nutrient levels for steady growth and rich polyp colouration.
Reef Compatibility
Fully reef safe. The Giant Polyp Gorgonia makes a spectacular centerpiece coral for mixed or soft coral reefs, providing structure, movement, and natural filtration. Its photosynthetic nature and tolerance to varied flow make it an ideal gorgonian for hobbyists seeking beauty without the feeding demands of non-photosynthetic species.
