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Description
Hammer Coral (Euphyllia ancora / Euphyllia hamiensis / Euphyllia paraancora) is a popular large polyp stony (LPS) coral known for its hammer- or anchor-shaped tentacles. It’s prized for its flowing motion and vibrant colors (typically green, gold, or pink) and is suitable for both beginner and intermediate reef aquarists.
🔍 Identification
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Common Names: Hammer Coral, Anchor Coral, Euphyllia Hammer
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Scientific Name: Euphyllia ancora (true anchor shape), Euphyllia paraancora (branching form)
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Appearance: Long, fleshy polyps with hammer-, anchor-, or T-shaped tips.
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Growth Forms:
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Wall Type: One continuous skeleton.
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Branching Type: Tree-like, with individual polyps on separate branches.
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💡 Quick Care Guide
| Aspect | Details |
|---|---|
| Lighting | Moderate to high (PAR 100–200). Adapt slowly to higher light levels. |
| Flow | Moderate, indirect flow to prevent tissue damage. |
| Placement | Mid to lower tank levels, away from aggressive neighbors. |
| Aggression | Semi-aggressive. Long sweeper tentacles can sting nearby corals. |
| Water Parameters | Stable conditions preferred: |
| Temp: 76–80°F (24–27°C) | |
| Salinity: 1.024–1.026 SG | |
| pH: 8.1–8.4 | |
| Alkalinity: 8–12 dKH | |
| Calcium: 400–450 ppm | |
| Magnesium: 1250–1350 ppm | |
| Feeding | Optional but beneficial. Feed mysis, brine shrimp, or coral foods 1–2×/week. |
| Growth Rate | Moderate. Faster in stable, nutrient-rich systems. |
✅ Tips for Success
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Acclimate slowly to light and flow changes.
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Maintain good calcium, alkalinity, and magnesium levels for healthy skeleton growth.
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Avoid placing too close to other corals—its sweeper tentacles can extend several inches at night.
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Target feeding promotes faster growth and polyp expansion.
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Watch for tissue recession, brown jelly disease, or algae growth near the base.
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