Ummm, why would you put baking soda in the yeast culture?
Moon

I breed dwarf crayfish for planted aquariums and grow trees in aquariums.
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Like I said I matched the original formula from nutrafin. From what
I've read about yeast cultures, baking soda slows the rate at which
the yeast consumes the sugar and produces CO2. It also seems... from
what I've read... that since I have soft water, the yeast will not
last more than a week without the baking soda which acts as a
neutralizer. You've never heard of this?