Unique Scolymia / Scoly Coral

Placement, Lighting & Flow

Unique Scolymia / Scoly Coral (Homophyllia australis) generally performs best under low to moderate reef lighting. A PAR range of approximately 50–150 is suitable, with the lower end of that range a sensible starting point for newly introduced specimens.

Place the coral on the sandbed or stable lower rockwork where its fleshy tissue cannot be abraded against sharp surfaces. If placed on rock, a slight angle can help prevent debris collecting around the mouth and central depression.

Provide low to moderate, indirect water movement. Flow should be sufficient to carry away waste and prevent detritus settling on the coral without continually folding or lifting the inflated tissue.

Feeding & Nutrition

Scolymia are photosynthetic and obtain much of their energy from symbiotic algae, but they are also capable feeders and benefit from occasional supplemental feeding.

Small portions of mysis shrimp, finely chopped krill or other marine foods, and appropriately sized LPS pellets can be offered once or twice per week. Feed when the coral is receptive and allow it time to draw food toward the mouth before restoring stronger water movement.

Avoid oversized meals and heavy feeding. Small portions are easier for the coral to process and reduce the amount of uneaten food entering the aquarium.

Compatibility & Spacing

Homophyllia australis should be given clear space from neighbouring corals. Although it does not normally produce the very long sweepers associated with some aggressive LPS species, feeding and defensive tentacles can extend beyond the visible tissue and direct contact can damage either coral.

Its large inflated tissue is particularly vulnerable to stings from more aggressive neighbours, so avoid placing Torch Corals, aggressive Chalices or other strongly stinging LPS within reach.

Growth & Behaviour

Scolymia is a solitary coral rather than a branching or rapidly spreading colony. Growth is typically slow, with the individual polyp gradually increasing in size as the skeleton develops beneath it.

Healthy specimens often become noticeably fuller when settled, sometimes inflating well beyond the apparent skeletal diameter. The coral may contract after feeding, handling, transport or changes in lighting and flow before expanding again.

Acclimation & Introduction

Following transport, begin in relatively subdued lighting with gentle indirect flow. Avoid immediately placing the coral under intense illumination, even if the intended permanent position receives more light.

Inspect the tissue and underside carefully before introduction. Check for tears, exposed skeleton, trapped debris, unwanted algae or other signs of damage. A suitable coral dip and separate observation period can reduce the risk of introducing unwanted organisms into an established reef.

Common Problems & Prevention

The large fleshy polyp can be damaged by sharp rockwork, falling objects, rough handling or excessive direct flow. Tissue injury around the skeletal edge can lead to recession if the coral remains irritated.

Excessive lighting is another common source of stress. Persistent contraction, paling or bleaching after a move may indicate that the coral is receiving more light than it can comfortably tolerate.

Keep the coral free of settled debris and avoid allowing sand or detritus to remain trapped on the oral disc. Consistent water quality and stable conditions are more important than frequent adjustments.

Signs of Stress

Temporary contraction after shipping, handling or feeding is normal. Persistent deflation, bleaching, exposed skeleton, tissue recession, excessive mucus or failure to respond to food are signs that the coral should be investigated.

Check lighting, flow, salinity, temperature and overall aquarium stability before making repeated changes. Adjustments should be gradual, particularly when changing lighting intensity.

Handling & Propagation

Handle the coral by the exposed skeleton or supporting base whenever possible and avoid touching or compressing the fleshy tissue. When fully inflated, the tissue can extend beyond the skeleton and is easily damaged.

Scolymia are poor candidates for routine propagation. Cutting a specimen carries a substantially higher risk than fragging many colonial LPS corals, and even surviving sections may take a very long time to regain the species' characteristic round form. For that reason, healthy show specimens are best kept intact.

Who Is This Coral Best Suited For?

Scolymia is a good choice for reef keepers looking for a colourful, relatively straightforward LPS showpiece for the lower areas of an established aquarium. Its solitary growth, dramatic inflation and highly variable colour patterns make it particularly effective as a focal coral in mixed reefs and LPS-focused displays.