Blastomussa (Blasto Coral)

Taxonomy & Identity

Blastomussa corals, commonly called "Blastos," are small-polyped LPS corals known for their vibrant colors and ease of care. Two species dominate the hobby: B. wellsi (larger polyps) and B. merleti (smaller polyps). Both are excellent choices for hobbyists seeking colorful, low-maintenance LPS corals.

Natural Habitat & Distribution

Blastomussa are found in the Western Pacific, particularly around Australia and Indonesia. They inhabit shaded reef areas, under overhangs, and on lower reef slopes where light levels are reduced. They often grow in small clusters or colonies in these protected microhabitats.

Morphology & Growth Forms

Blastomussa grow as colonies of separate, fleshy polyps connected by encrusting tissue. B. wellsi has large, puffy polyps up to 2 inches across that can look like clusters of grapes. B. merleti has smaller polyps around 0.5 inches. Colors include red, orange, green, and multicolored varieties with contrasting centers or rings.

Lighting Requirements & Spectrum

• Intensity: Low to moderate
• Target PAR: 30–120

Blastomussa prefer subdued lighting that mimics their shaded natural habitat. They can bleach or fail to fully expand under intense light. Lower tank positions, caves, and shaded areas are ideal. Blue spectrum lighting enhances fluorescent colors present in many specimens.

Flow Requirements & Patterns

• Intensity: Low
• Type: Gentle, indirect

Low flow is preferred for Blastomussa. Strong currents prevent full polyp expansion and can damage the soft tissue. Minimal water movement that keeps the coral clean without battering it is ideal. Protected areas away from direct powerhead output work best.

Nutrient Dynamics & Water Chemistry

Blastomussa are tolerant of various water conditions and thrive in moderate nutrient systems. They're not as demanding as many LPS corals regarding parameters. Stability is more important than hitting specific targets. Generally very forgiving.

Feeding Biology & Symbiosis

Blastomussa contain zooxanthellae and photosynthesize but respond well to feeding. Polyps can capture and consume appropriately sized food items.

• Mysis and brine shrimp
• Reef Roids and coral powders
• Small LPS pellets
• Finely chopped meaty foods

Feeding 1–2 times per week encourages growth and enhances coloration. Each polyp can be individually target fed. Fed specimens often show faster multiplication of new polyps.

Common Diseases, Pests & Predators

• Generally very disease resistant
• Tissue recession from excessive light or flow
• Damage from aggressive tankmates
• Uncommon pest issues

Blastomussa are remarkably trouble-free. Most issues stem from improper placement rather than disease or pests. If polyps fail to expand fully, reduce lighting and flow. They're among the more bulletproof LPS options available.

Compatibility & Placement

Blastomussa are peaceful corals with minimal aggressive capability. They need protection from more aggressive neighbors. Their preference for shaded, low-flow areas makes placement easy but limits options somewhat.

• Best zone: Lower tank, shaded areas, caves
• Give space: 2–3 inches from other corals
• Protect from: Aggressive LPS with sweepers

Fragging Techniques

Blastomussa frag easily by cutting or breaking through the skeleton between polyps. Each frag should have one or more complete polyps with adequate skeleton. They recover quickly from fragging and begin growing new polyps within months. Natural multiplication also occurs as colonies mature.

Aquacultured Strains & Trade Names

Many color varieties exist including "Red Blasto," "Superman Blasto" (blue with red center), "Ultra Blasto" with intense colors, and various multicolored morphs. Australian specimens are particularly prized for vibrant colors. Most in the trade are aquacultured and hardy.

Difficulty Rating & Summary

Difficulty: Beginner

Blastomussa are excellent beginner LPS corals that combine beautiful colors with easy care requirements. Their tolerance of various conditions and minimal demands make them nearly foolproof. For hobbyists wanting colorful LPS without the challenges of more demanding species, Blastos are an ideal choice.