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Hologram Hammer
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Hologram Hammer Coral Frag
The Hologram Hammer is a premium Euphyllia coral known for its shifting, multi-tonal colouration that appears to change under different lighting angles. With flashes of green, gold, blue, and subtle rainbow hues across its hammer-shaped tips, this coral delivers a true “holographic” effect that makes it an immediate focal point in any reef aquarium.
Paired with constant, flowing movement, the Hologram Hammer offers standout visual impact while retaining the dependable care profile Euphyllia corals are loved for.
Natural Habitat & Distribution
Hammer corals (Euphyllia ancora / Euphyllia paraancora) are naturally found throughout the Indo-Pacific, including:
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Indonesia
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Australia (Great Barrier Reef)
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Fiji and Tonga
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The Philippines
They typically inhabit sheltered reef slopes and lagoon environments, where light levels are moderate and water movement is gentle to indirect.
A Brief History
Hammer corals have long been a cornerstone of the reef hobby due to their movement, resilience, and distinctive form. As LED lighting advanced, rare colour morphs with layered fluorescence and shifting tones became highly sought after.
“Hologram” variants are prized for their ability to display multiple colours simultaneously, creating depth and visual complexity that stands out even in mature, coral-dense reef systems.
Appearance & Growth
Classed as an LPS (Large Polyp Stony) coral, the Hologram Hammer features long, fleshy tentacles ending in pronounced hammer-shaped tips.
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Multi-tonal colouration with holographic effect
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Strong fluorescence under blue lighting
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Excellent polyp extension when healthy
Growth is steady in stable reef systems, with heads dividing over time.
Placement & Lighting
The Hologram Hammer performs best under moderate lighting, which allows its layered colours to fully develop.
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Lighting: Medium
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Best placed in the mid to lower areas of the aquarium
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Excessive light may wash out colour or stress tissue
Flow Requirements
Provide gentle to moderate, indirect flow. Tentacles should sway naturally without being blasted by direct current.
Water Chemistry
Stable reef parameters are essential for long-term success. Maintain consistent levels of:
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Calcium
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Alkalinity
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Magnesium
Along with stable salinity and temperature. Regular testing and water changes are recommended.
Feeding
While largely photosynthetic, the Hologram Hammer benefits from occasional feeding, including:
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Small meaty foods (mysis, brine shrimp)
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LPS-specific coral foods
Feeding once or twice weekly can enhance growth and colour depth.
Temperament & Spacing
Hammer corals are semi-aggressive and may extend sweeper tentacles at night.
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Allow adequate spacing around the frag
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Avoid placing too close to other Euphyllia or delicate corals
Frag Size & Natural Variation
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Frag size: Typically 1–2 heads
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Colour balance and intensity may vary between frags and shift depending on lighting and tank conditions.
Care Summary
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Care Level: Moderate
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Flow: Low–Medium
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Lighting: Medium
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Temperament: Semi-Aggressive
🪸 Coral Care Guide
Care Level
Moderate
Lighting
Medium
Water Flow
Moderate, indirect flow.
Placement
Lower to middle areas of the aquarium.
Temperament
Peaceful.
Growth Rate
Moderate, with gradual skeletal growth and increasing polyp density over time.
Frag Size
Typically supplied as a multi-polyp frag unless otherwise stated.
💧 Water Parameters
Purple Goniopora thrive in stable reef aquariums with consistent water chemistry.
Recommended Parameters
- Stable Alkalinity
- Calcium
- Magnesium
- Stable Nitrate & Phosphate levels
- Trace elements including iodine and iron are beneficial.
Avoid ultra-low nutrient systems, as Goniopora generally perform best in mature, nutrient-balanced aquariums.
🍤 Feeding & Nutrition
Purple Goniopora benefit from regular supplemental feeding to encourage long-term health, vibrant colour and strong polyp extension.
Recommended Foods
- Fine powdered coral foods
- Phytoplankton
- Micro-plankton blends
- Small particulate coral foods
Feeding Frequency
Feed lightly but consistently 2–3 times per week.
🌊 Placement & Acclimation
Purple Goniopora appreciate thoughtful placement and a gentle introduction to your aquarium.
Placement
- Lower to middle areas of the aquarium.
- Allow plenty of space for full polyp extension.
- Avoid direct contact with aggressive or stinging corals.
- Prevent polyps from rubbing against rockwork.
Lighting
Medium lighting is recommended.
Too much light may cause the coral to retract, while insufficient lighting can reduce extension.
Light acclimation is recommended whenever introducing a new specimen.
Water Flow
Provide moderate, indirect flow that keeps the polyps gently swaying.
Avoid strong, direct flow, which may prevent full extension.
Random, alternating flow patterns generally produce the best results.
🌍 Natural Habitat
Purple Goniopora originate from the Indo-Pacific region and are commonly found throughout:
- Indonesia
- Australia's Great Barrier Reef
- Fiji
- Tonga
- Papua New Guinea
- Central and Western Pacific reef systems
In the wild they inhabit sheltered lagoon environments and protected reef zones with moderate lighting, gentle water movement and nutrient-rich conditions.
Once considered difficult to keep, advances in modern reef keeping—including improved lighting, flow control and nutrition—have made healthy, aquacultured Goniopora far more reliable long-term additions to today's reef aquariums.
⭐ ReefGro Expert Advice
Purple Goniopora is one of our favourite LPS corals thanks to its elegant movement and rich purple colouration.
When fully extended, hundreds of delicate tentacles create constant movement that contrasts beautifully with SPS colonies and other fleshy LPS corals, making it an excellent centrepiece for mixed reef aquariums.
For the best results:
- Introduce the coral slowly using light acclimation.
- Maintain stable water chemistry.
- Feed regularly with fine particulate foods.
- Avoid placing it where neighbouring corals can sting the extended polyps.
- Be patient during acclimation—healthy Goniopora often become more fully extended as they settle into stable conditions.
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