Euphyllia paraancora (Fimbriaphyllia paraancora)

Euphyllia paraancora is a branching Hammer coral. Its large polyps move dramatically in the current, and the tips of its tentacles are hammer- or anchor-shaped. As it grows, the coral forms new heads at the ends of its branching calcareous skeleton.

The species is still commonly known in the hobby as Euphyllia paraancora, even though its currently accepted scientific name is Fimbriaphyllia paraancora.

Characteristics

• Branching LPS coral
• Large polyps with hammer- or anchor-shaped tentacle tips
• Forms new, distinct coral heads as it grows• Moderately easy to care for in a stable reef aquarium
• Can grow long sweeper tentacles and harm nearby corals

Care

Light: Low to moderate, approximately 50–150 PAR. Acclimate new coral to stronger lighting gradually.

Flow: Moderate and varied. Avoid continuous strong direct flow, which can press the tissue against the skeleton and damage the coral.

Placement: Leave plenty of space around the coral. Hammer corals can grow sweeper tentacles whose stinging cells can harm nearby corals.

Feeding: Obtains a large part of its energy through photosynthetic symbiotic algae. Target feeding is not essential, but small mysis, pellets, or other protein-rich foods suitable for LPS corals can support growth.

Recommended Water Parameters

Temperature: 24–26 °C
Salinity: 34–35 ppt
KH: 7–9 dKH
Calcium: 400–450 mg/l
Magnesium: 1250–1400 mg/l
Nitrate: 2–15 mg/l
Phosphate: 0.03–0.15 mg/l
pH: 8.0–8.4

Hammer corals build a calcareous skeleton, so the stability of KH and calcium, in particular, is important. Stability of water parameters is more important than hitting a single target value precisely.

Additional Information

Scientific name: Fimbriaphyllia paraancora
Former name: Euphyllia paraancora
Coral type: LPS
Growth habit: Branching
Origin: Indo-Pacific
Difficulty level: Easy–Moderate
Light: Low–Moderate, approximately 50–150 PAR
Flow: Moderate, varied
Aggressiveness: Moderate–High