Any ideas about low pH?

[sphelps]

Low pH is usually from CO2 content. Many people who run Ca reactors experience lower pH. Some possible solutions:

• Introduce fresh air by running skimmer air intake to outside air
• Reverse refugium lighting (refugium lights on when tank lights off)
• Supplement Ca and Alk with Kalkwasser or Calcium Hydroxide (reacts with CO2 and maintains high pH)