Calcium (Ca)
Aquarium: 380 - 450 ppm | Ocean: 420 ppm

Alkalinity (KH)
Aquarium: 8 - 12 dKH / 2.86 - 4.29 meq/L | Ocean: 7 dKH / 2.5 meq/L

Magnesium (Mg)
Aquarium: 1200 - 1400 ppm | Ocean: 1280 ppm

Phosphate (PO₄)
Aquarium: 0.01 – 0.03 ppm (Preferred) / 0.01 – 0.1 ppm (Tolerable) | Ocean: 0.005 ppm

Nitrate (NO₃)
Aquarium: 1 – 10 ppm (Preferred) / 1 – 20 ppm (Tolerable) | Ocean: Less than 0.1 ppm (typical but varies)

Nitrite (NO₂)
Aquarium: 0.0 ppm typically | Ocean: Less than 0.0001 ppm (typical but varies)

Ammonia (NH₃)
Aquarium: 0 ppm | Ocean: Less than 0.1 ppm (typical but varies)

Salinity
Aquarium: 1.023 - 1.026 SG / 32 - 35 ppt | Ocean: 1.025 - 1.027 SG / 34 - 36 ppt

Temperature
Aquarium: 76° - 80°F (Must be kept stable) | Ocean: Variable

pH
Aquarium: 8.1 - 8.3 (Preferred) / 7.8 - 8.4 (Tolerable) | Ocean: 8.1 - 8.3 (Varies in lagoons)

ORP
Aquarium: 250 - 400 mV | Ocean: Variable

Iodine (I)
Aquarium: 0.06 ppm | Ocean: 0.06 ppm (Varies in lagoons)

Strontium (Sr)
Aquarium: 7 - 9 ppm | Ocean: 8 ppm

Iron (Fe)
Aquarium: Below Kit Detection | Ocean: 0.000006 ppm

Boron (B)
Aquarium: Less than 10 ppm | Ocean: 4.4 ppm

Silica (Si)
Aquarium: Less than 1 ppm (Lower if diatoms are a problem) | Ocean: Less than 0.06 - 2.7 ppm