The purple blasto coral (Blastomussa wellsi) has rapidly become one of the most sought-after large polyp stony corps in the reef aquarium hobby. Known for its vivid fluorescence and fleshy tentacles, this LPS coral delivers an understated drama — a mottled pink-to-purple base often surprises night-time displays, making it a centerpiece for low-to-moderate light setups. While not as flashy in photosynthetic intensity as some of its SPS cousins, the purple blasto coral wins hearts with its calm growth, hardiness, and bold visual presence. Ideal for beginner and advanced hobbyists alike, it grants entry-level LPS beauty without the fragility often associated with demanding corals.
Understanding Purple Blasto Coral
The purple blasto coral, scientifically named Blastomussa wellsi, belongs to the family Faviidae. Native to shallow reefs across the Indo-Pacific, particularly around Fiji, Tonga, and the Coral Sea, this LPS or large polyp stony coral clusters its polyps on encrusting or submassive colonies. Its distinctive rounded polyps emerge from the substrate with expanded fleshy tentacles. Coloration ranges from bright pink and violet to dark maroon or neon purple, based on lighting conditions and environmental stressors. What’s striking is the fluorescent “blasto glow” it emits under actinic lighting, giving it a night-time appeal unmatched by many related corals.
Colony Shape and Polyp Isolation
Unlike many corals which branch or encrust endlessly, the purple blasto grows in isolated round polyps each pointing to the light direction. The adult polyps, linked by a thin skeletal bump or coenosarc tissue, flower outward from a central stalk. As they thicken, they begin to fray or skeleton fragments separate individual polyps, creating mushroom-like clusters. This bifurcation allows keepers to choose tightly clustered groups or solitary colony formations for dramatic aquarium displays.
Why Reef Keepers Value This Coral
Reef aquarium hobbyists persistently praise the purple blasto for its low-to-moderate lighting compatibility. Placement on mid-to-low aqua-scapes fosters intense fluorescing hues without the need for high-intensity LED or metal halide systems. In fact, higher PAR often washes out the purple hues, dimming the “glow” effect. With its hardy tissue covering the skeleton and limited oxygenation dependence, this coral tolerates typical reef tank temperatures (76–81°F), moderate flow, and standard alkalinity/salinity.
Placement and Lighting Considerations
For optimal coloration, position your purple blasto coral beneath actinic-blue dominant light setups exhibiting 50–100 PAR. Mid-rocky areas beneath LED spots are ideal—not so intense as to wash out color, but not in the dark where fluorescence fails to activate. Too much light in your reef tank bleaches the pink tissue, leading to unsightly “white-out” or reduced polyp extension. Unlike some LPS cousins, this coral does not require metal halide lighting to thrive. A well-calibrated multi-channel LED system with UV supplementation often brings out the most vibrant fluorescence.
Feeding and Nutrition
The purple blasto coral is a passive filter feeder. While it supplements nutrition through zooxanthellae, it benefits significantly from direct feeding of meaty particles. Ideal foods include:
- Baby brine shrimp, finely chopped mysis, or reef-roid paste applied using a syringe or turkey baster
- Finely particulate coral foods targeted directly at night when tentacles are fully expanded
- Liquid amino acids and phytoplankton supplements, especially in minimal-feeding setups
Feeding enhances growth, coloration, and regenerating tissue. Avoid broadcast-feeding large particles near neighboring LPS—they may cause stress or overfeeding. Night-time feastings are most safe, after flow has been briefly reduced to prevent food being dispersed without ingestion by the coral.
Compatibility and Aggression in Reef Tanks
The purple blasto coral shows moderate aggression. While not the most peaceful LPS, it does not wage constant war as some Euphyllia or Galaxea. It maintains a selection of “sweeper” tentacles — used during nighttime to ward off neighboring corals near its skeleton zone. Thus, ensure adequate spacing (at least 2–3 inches) between LPS species to prevent tissue damage. Despite its defenses, it coexists peacefully with most SPS corals, zoanthids, and mushroom corals. A “lawful neighbor” arrangement allows multiple LPS species to share reef walls without constant territory disputes.
Phytopathology & Common Pitfalls
While sturdy, the purple blasto is susceptible to tissue recession due to incorrect lighting or nutrient spikes. Common issues recognized by hobbyists include:
- Light Bleaching: Polyp tissue turns paler or white when exposed to excessive PAR (above 150), leading to reduced fluorescence and detachment from skeleton.
- Brown-out: A sudden appearance of brown mucus-like tissue suggests nutrient stress or salinity mismatch. Check water parameters and consider magnesium/calcium balancing.
- Tissue Recession: Caused by damaged skeleton, pest introductions (like nudibranchs), or bacterial blooms. Use dips like CoralRx and visually inspect at night.
Recovery is possible with stable alkalinity, moderate flow, and stress reduction. Always rinse new frags with coral dip before introducing to the display tank. When submerged in debris, the coral often slimes as a protective response — do not panic prematurely.
Water Parameter Stability
| Parameter | Optimal Range |
|---|---|
| Temperature | 76–81°F |
| Salinity (SG) | 1.024–1.025 |
| pH | 8.1–8.4 |
| Alkalinity (dKH) | 8–12 |
| Calcium (ppm) | 400–450 |
| Magnesium (ppm) | 1250–1350 |
| PAR | 50–100 |
| Flow | Low-to-moderate, mild circular currents |
These parameter ranges represent ideal conditions for long-term coral health. While the purple blasto handles minor fluctuations, chronic deviations invite tissue stress and color fade. Dose magnesium and alkalinity carefully; imbalance often causes mysterious bone-white bleaching in nighttime photos.
Propagation and Fragging
Fragging the purple blasto coral requires precision, patience, and sharp tools. Allow the mother colony to mature for at least six months before fragmenting. Use bone cutters or a diamond-blade saw to carefully separate individual polyps or small clusters, leaving a portion of the skeleton attached to each frag. Mount plugs or rubble using cyanoacrylate gel (super glue) or underwater-safe epoxy. Gentle handling prevents tissue撕裂 (tearing) and bacterial infection.
Once in quarantine or tank setup, maintain stable water parameters and reduced flow for healing (one to two weeks). If tissue appears healthy and expands within ten days, fragging can be considered successful. Fragging under poor lighting conditions may delay fluorescence restoration. Many successful reef businesses generate revenue through frag swaps, propagation programs, and aquaculture certifications.
Symbolism and Cultural Appeal
Among collectors, the blasto coral represents more than just a tank piece. Its glow under actinic light resembles deep-sea creatures, giving aquascapes an “alien” or “extraterrestrial” look. Many reef keepers now celebrate “Blasto Mondays” — showcasing vivid coral formations around the globe. Cultural interest in this coral has evolved from scientific curiosity into a modern symbol of marine artistry — oceanic life captured in home tanks. As underwater photography grows, so does the appreciation of fluorescent stony corals and their mesmerizing display.
Science meets beauty in the purple blasto. It is low-maintenance, visually captivating, thriving in reef tanks of nearly every experience level. From beginner hobbyists seeking forgiving LPS entry points to advanced aquarists crafting bioluminescent masterpieces, the purple blasto coral continues to captivate the reef community. Its resilience, color adaptability, and hardy traits ensure it remains a staple of reef tank culture for years to come.
