Description
Space Invader – Pectinia alcicornis
Aquacultured at Reeflections
Pectinia alcicornis, commonly known as the Space Invader, is one of the most striking and recognizable chalice-type LPS corals in the reefing world. Characterized by its vivid neon-green tissue contrasted with glowing yellow eyes and deep purple skeletal ridges, this coral’s architecture is as dramatic as its color. The elongated, antler-like ridges and undulating valleys give it a sculptural appearance, while its intense fluorescence under blue-spectrum lighting makes it an unmistakable centerpiece in any reef display.
Lighting: Moderate (80–150 PAR); blue-spectrum LEDs enhance the coral’s fluorescent greens and yellows while maintaining rich base coloration
Flow: Low to moderate; prefers indirect flow to prevent tissue irritation and promote gentle polyp movement
Placement: Bottom to mid-level on rock or sand substrate; allow space for its expanding ridges and sweeper tentacles
Temperature: 76–80°F (24–27°C)
Salinity: 1.024–1.026 SG
pH: 8.1–8.4
Alkalinity: 8–10 dKH
Calcium: 420–450 ppm
Magnesium: 1300–1400 ppm
Nutrients: Moderate (NO₃ 5–15 ppm, PO₄ 0.05–0.10 ppm); stable nutrient balance maintains tissue density and fluorescence intensity
Feeding: Photosynthetic but benefits from direct feeding 1–2 times per week with small meaty foods like mysis shrimp, LPS pellets, or reef roids to support growth and recovery
Aggression: High; extends long, potent sweeper tentacles capable of stinging neighboring corals—maintain 15–20 cm clearance
Growth Rate: Moderate; expands through thick, contoured ridges and forms large, lobed colonies over time
Care Level: Intermediate – hardy under stable conditions but sensitive to rapid parameter changes and excessive light
Compatibility: Semi-aggressive; ideal for LPS-dominated systems with careful spacing; pairs well visually with contrasting species such as Lobophyllia and Chalice corals
