I have been cycling my tank for two weeks now. As the water has evaporated, I have been replacing it with fresh tap water (I know, I know-- I will start using RO
from now on).
Today I checked the readings:
- .3 g/ml
My 37 gallon tank has 12 lbs of live rock, 32 lbs of base rock, and 40 lbs of aragonite sand in it. Nothing else in there except lots of diatoms.
I thought the aragonite sand would buffer the pH to something closer to 8.3, even though I am adding fresh water with a pH of 7.0. Should I buffer the fresh water before topping off the tank? Every reference I have read says top off the tank with fresh water, but I have never seen one where they say buffer the water first.
So, what should I do at this point? Add sodium bicarb or go get something else to add to the tank?