the preferred of ph is between 8.2-8.4 So it isn't like your way off so I wouldn't worry.
Just a FYI
is logorithmic, each 1.0 rise or fall in ph
is ten times more alkaline or acidic respectively. So a difference of .2 or .4 is 2 - 4 times more alkaline than the 8.0 your working with now 8O
Do you have any substrate?
This is really a misconception. Aragonite substrate will not buffer above 8.0, for it to buffer higher than that the ph
would have to drop drastically low to dissolve enough aragonite.
All that said, without knowing the CA
reading or Mg
, it is very difficult to say whether the ALK
is good or not. It appears to be, but without the proper CA
reading, it may be way off. Most likely the cause of the lowered ph
is increased CO2
n the water, try creating more turbulence at the surface or even pumping air in from the outside to increase o2
levels in the tank.