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Saltwater Aquarium Guide Reef-keeping magazine
Coral Care

Coral Color Boost: Lighting, Nutrients, and the Color Triangle

How to manipulate lighting spectrum, nitrate, and phosphate to bring out vibrant pinks, greens, and oranges in SPS.

Zoanthid corals with bright centres photographed under blue light
Photo: Alex Damske / Unsplash

SPS color is the result of a delicate balance between light, nitrate, and phosphate. Push any one too far and corals brown out or pale.

The color triangle

  • Light: PAR 250–400
  • Nitrate: 5–10 ppm
  • Phosphate: 0.03–0.08 ppm
Pale corals = nutrients too low. Dark corals = nutrients too high. Browned corals = light too low.