Ideal Reef Tank Water Parameters

Stable water conditions are the holy grail for every aquarium owner. The more consistent your water parameters are, the better your corals will grow and the more your fish will thrive.

Every aquarium will find its natural balance point for every parameter, but these values will help you set that balance in the correct ranges.

Below are the typical values you should be aiming for in your saltwater aquarium:

  • Temperature: 78 – 80°F or 25 – 27°C
  • Specific Gravity (Salinity): 1.023 – 1.025
  • Ph: 8.1 – 8.4
  • Ammonia: 0ppm
  • Nitrite: 0ppm
  • Nitrate: <15ppm
  • Alkalinity: 8 – 12 dkh
  • Calcium: 350 – 450ppm
  • Magnesium: 1250 – 1350ppm
  • Phosphate: <0.03ppm for SPS Corals
  • Phosphate: <0.05ppm for LPS, Zoas & Soft Corals
  • Phosphate: <0.2ppm for Fish Only

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Hi, I'm Richard and I have been an avid aquarist for over 30 years with a passion for Saltwater Aquariums. I love to pass on my knowledge to help others get the same amount a pleasure out of this hobby as I do. View my About Me page to find out more about me & my mixed reef aquarium.

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