Seawater has a strong alkalinity, and the pH value of natural seawater often stabilizes between 7.9 and 8.4. Marine ornamental fish have a higher requirement for water pH, so the pH of seawater in the aquarium should be maintained between 8.0 and 8.5.

After keeping marine fish in the aquarium, the pH of the seawater often changes. When the pH of the seawater drops to 8.0, it indicates that the buffering capacity of the seawater is decreasing, which directly affects the normal activities of marine fish. CO2 should be replenished in the water in a timely manner. The specialized CO2 reaction generator can be used to supplement CO2.

About the acidity and alkalinity (pH) of seawater aquariums