Description
Acropora tenuis – Acropora tenuis
Acropora tenuis is one of the most iconic and color-diverse small-polyp stony (SPS) corals in the reef aquarium hobby. Valued for its compact branching structure and exceptional polyp extension, this species is responsible for many of the world’s most famous named strains. Under ideal conditions, A. tenuis displays explosive coloration—often combining neon greens, blues, yellows, pinks, and purples with contrasting growth tips and vibrant corallites. Its tight branch formation and heavy polyp “fuzz” give it a dense, high-energy appearance that makes it a true centerpiece in advanced SPS systems.
Lighting: High (250–400 PAR); intense blue-dominant or hybrid lighting is essential to maintain vivid coloration and strong growth tips
Flow: Strong, turbulent flow; requires chaotic, multidirectional water movement to keep tissue clean and evenly supplied with nutrients
Placement: Upper regions of the aquarium with open space above and around the colony; avoid shading and ensure high flow exposure
Temperature: 76–80°F (24–27°C)
Salinity: 1.025–1.026 SG
pH: 8.1–8.4
Alkalinity: 8–9 dKH; absolute stability is critical—fluctuations can result in rapid tissue necrosis
Calcium: 420–460 ppm
Magnesium: 1300–1400 ppm
Nutrients: Low to moderate (NO₃ 2–10 ppm, PO₄ 0.02–0.08 ppm); ultra-low nutrients often cause pale coloration, while balanced nutrients enhance saturation
Feeding: Primarily photosynthetic but benefits from regular broadcast feeding with amino acids, reef plankton, or coral foods to support coloration and polyp extension
Aggression: Low; non-stinging, though fast growth can lead to shading of nearby SPS if not spaced properly
Growth Rate: Moderate to fast; forms dense, compact colonies with thickened branch tips under optimal conditions
Care Level: Advanced – demands stable chemistry, strong lighting, and high flow
Compatibility: Peaceful; best suited for SPS-dominated systems alongside other high-energy corals such as Acropora millepora and A. yongei
