Better add cc or OS till u get 6.5
BTW u feed heavily?
If u want can use the baking soda powder to buffer ph everytume u change water.. but must be careful.. add a little bit like a half a teaspoon for every 2hr until ur desire ph.. then remembered how much powder u need for the atm of water change. . And add the baking soda every time u change water.
Too much trouble for me.. so I prefer to add OS.
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