Description
Bullseye Rock Mushroom (Fungiidae Coral) (Orange Rhodactis sp.)
(Also known as Orange Bullseye Mushroom Coral, Hairy Mushroom Coral, or Elephant Ear Mushroom Coral)
Overview
The Orange Bullseye Rock Mushroom (Rhodactis sp.) is a vibrant and hardy soft coral (Corallimorpharian)celebrated for its rich orange colouration and distinctive bullseye pattern. Its large, fleshy disc features radiating rings or zones of contrasting tones, often highlighted with subtle reds, golds, or green undertones. Covered in short, bubble-like vesicles that give a soft, textured look, this coral adds both colour and dimension to shaded areas of the reef. Adaptable, resilient, and visually striking, the Orange Bullseye Mushroom is an ideal coral for aquarists seeking to bring warmth and contrast to their display.
Origin
Native to the Indo-Pacific region, including the Great Barrier Reef, Coral Sea, Fiji, Tonga, Indonesia, and the Solomon Islands. Commonly found in protected reef slopes, lagoons, and shaded rock crevices, where light and water flow are moderate to low.
Feeding
The Orange Bullseye Mushroom Coral is photosynthetic, hosting zooxanthellae that provide most of its energy. It also benefits from occasional feeding to enhance growth and colour intensity. Feed 1–2 times per week with:
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Finely chopped seafood (shrimp, fish, clam)
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Mysis or enriched brine shrimp
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Marine snow or fine coral foods
Target feeding promotes faster tissue growth and helps maintain vibrant pigmentation.
Lighting
Low to moderate lighting. Rhodactis prefers gentle, diffused illumination and may bleach under high-intensity lighting.
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PAR range: 50–150 µmol/m²/s
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Ideal placement in shaded or lower sections of the aquarium.
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Blue and actinic spectrums enhance the coral’s orange fluorescence and contrast.
Water Flow
Low to moderate, indirect flow. Gentle currents are best, allowing the coral to expand fully while preventing debris accumulation. Excessive flow can cause the coral to close or detach from its substrate.
Placement
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Place on lower rockwork or sandy substrate where light and flow are subdued.
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Ensure space for expansion, as Rhodactis can grow large and spread through budding.
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Avoid placing directly next to aggressive stinging corals or in areas with sharp rock edges.
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Excellent for shaded sections, under ledges, or in corners of mixed reef systems.
Tank Mates
Reef safe. Compatible with:
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Peaceful reef fish (wrasses, gobies, tangs, clownfish, blennies, etc.)
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Invertebrates such as shrimp, snails, and hermit crabs
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Other soft corals and non-aggressive LPS species
Avoid:
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Aggressive stinging corals (e.g., Euphyllia, Galaxea, Hydnophora)
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Large angelfish or butterflyfish that may pick at its fleshy tissue
Aggression
Moderate. While not equipped with long sweeper tentacles, Rhodactis can release mild toxins (allelopathy) and overgrow nearby corals, competing for space. Allow sufficient spacing to prevent interference.
Experience Level
Beginner. The Orange Bullseye Mushroom Coral is exceptionally hardy and forgiving, making it an excellent choice for aquarists of all skill levels. It adapts easily to varied lighting and nutrient levels and thrives in both nano and large reef aquariums.
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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Alkalinity (dKH): 8–12
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Calcium: 380–450 ppm
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Magnesium: 1250–1350 ppm
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Nitrate: <10 ppm (tolerant up to 15 ppm)
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Phosphate: <0.05 ppm
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Tank Size: Minimum 50 litres (13 gallons); suitable for nano reefs or larger systems
Consistent water quality and moderate nutrients support healthy tissue and maintain vibrant orange tones.
Reef Compatibility
Fully reef safe. The Orange Bullseye Rock Mushroom Coral adds brilliant colour and subtle movement to the reef aquarium. Its resilience and adaptability make it a perfect coral for shaded or low-light areas, contributing warmth and natural balance to mixed or soft coral systems.
