pH dropping at night...what to do?
So I recently started adding DIY Co2 to my CBS tank to lower the pH, and it has definitely been working. The only thing is that during the day it is between 6.8-7.0, but at night it drops down to like 6.4. Should I be concerned about this? My kH is 2 degrees, but should I raise it to keeping these fluctuations from happening?