Indonesian Blue-Green Wall Hammer Coral

Placement, Lighting & Flow

Indonesian Wall Hammer Coral (Fimbriaphyllia ancora) performs best under moderate reef lighting. A PAR range of approximately 50–150 provides a suitable working range, with lower to middle rockwork generally offering an appropriate starting position.

Provide low to moderate, indirect and preferably variable water movement. The large fleshy polyps should sway gently rather than being continuously pushed in one direction. Strong direct flow can prevent full expansion and may force the soft tissue against the sharp underlying wall skeleton.

Wall Hammers can be particularly vulnerable to tissue damage along the edge of the skeleton, so placement should prevent the expanded coral from repeatedly contacting rockwork. When introducing a new specimen, begin conservatively with lighting and increase exposure gradually if required.

Feeding & Nutrition

Wall Hammer Corals are photosynthetic and obtain much of their energy from their symbiotic algae, so regular target feeding is not essential. Supplemental feeding is nevertheless beneficial and may support tissue condition, growth and recovery.

Small amounts of appropriately sized food can be offered approximately once or twice per week. Suitable foods include mysis shrimp, enriched brine shrimp, finely chopped marine foods and small LPS coral pellets.

Hammer Corals are not always aggressive feeders. Offer small portions when feeding tentacles are visible and avoid forcing large pieces onto the coral. Excess food can become trapped between the polyps and contribute to declining water quality.

Compatibility & Spacing

Wall Hammer Corals are aggressive LPS corals and can extend sweeper tentacles capable of damaging neighbouring corals. Allow generous clearance around the entire colony, including space for both daytime expansion and longer nighttime sweepers.

Hammer and Frogspawn Corals can sometimes tolerate relatively close placement, but compatibility should never be assumed. Direct tissue contact between unrelated colonies should be monitored carefully.

Torch Corals should be given substantially more separation. They are generally more aggressive than Hammer and Frogspawn Corals and can cause serious tissue damage if their tentacles reach a Wall Hammer.

Growth & Behaviour

Fimbriaphyllia ancora has a wall growth form rather than separate branching heads. Its corallites develop as a continuous meandering skeletal wall covered by large fleshy polyps.

Wall Hammers generally grow more slowly than branching Hammer varieties. Under stable conditions the colony gradually extends along its skeletal margin, becoming broader and more substantial over time.

Healthy specimens normally display significant daytime expansion and gentle polyp movement. Temporary retraction can occur after transport, feeding or disturbance, but prolonged contraction should prompt closer inspection.

Acclimation & Introduction

After transport, place the coral in a sheltered position with moderate lighting and gentle indirect flow. Allow the tissue to expand and settle before deciding whether the coral needs to be moved to a different permanent position.

Inspect the entire skeletal margin carefully before introduction. Look for damaged or receding tissue, exposed skeleton, unwanted algae or signs of infection. Because a Wall Hammer has continuous living tissue across its skeleton, damage can sometimes affect a larger portion of the colony than it would in a branching Hammer.

A suitable coral dip and separate observation or quarantine period can reduce the risk of introducing pests or disease into the display aquarium.

Common Problems & Prevention

Wall Hammer Corals are more susceptible to tissue recession and infection than many branching Hammer varieties. Physical damage, transport stress, unstable conditions and injury against the skeleton can all create an opportunity for rapid tissue deterioration.

Brown jelly-like tissue breakdown is a particular concern with fleshy Euphylliid-type corals. Any area showing rapidly deteriorating tissue, excessive mucus or spreading recession should be investigated promptly.

Strong direct flow should be avoided, but sufficient circulation is still important to keep the colony clean and prevent detritus settling between the polyps. Stability and prevention of tissue damage are particularly important with wall-forming specimens.

Signs of Stress

Temporary retraction following transport or handling is normal. Persistent contraction, poor inflation, bleaching, unusual darkening, exposed skeleton, excessive mucus or visible tissue recession are signs that the coral requires attention.

Check lighting and flow first, followed by salinity, temperature and general aquarium stability. Avoid repeatedly relocating the coral or changing several environmental factors simultaneously.

Handling & Fragging

Handle a Wall Hammer by the exposed skeleton or mounting base whenever possible and avoid touching or compressing the fleshy polyps. The tissue can extend considerably beyond the skeleton and is easily torn.

Wall Hammer Corals are substantially more difficult to frag than branching Hammers because cutting the colony usually requires cutting through or very close to continuous living tissue. Healing is slower and the risk of infection is higher.

Propagation is therefore best left to experienced reef keepers using clean coral-cutting equipment and strict hygiene. Gloves and eye protection should be worn, and newly cut specimens require careful observation during recovery.

Who Is This Coral Best Suited For?

Indonesian Wall Hammer Coral is best suited to intermediate reef keepers who can provide stable aquarium conditions, moderate lighting, gentle variable flow and adequate spacing from neighbouring corals. Its large fleshy polyps, distinctive wall growth and flowing movement make it an exceptional feature coral for mixed reefs and LPS-focused displays.