up to .25 pH swings at night - too much?
Obviously due to high co2 levels, I have been getting a pH variance of .25 over each night. It is normally 6.9 during the day, and reaches as low as 6.65 at night and early morning before the lights turn back on. the co2 variance is between 25 and 38 ppm (day/night). I have not noticed any harm to the fish or any gasping. However, them constantly adjusting to new pH worries me.
other than buying a pH controller, is there any alternative to fight this? airstones at night to help remove the excess co2 maybe?
450g Planted Discus Tank - Work in Process!