Rena micro bubblers. I suggested that Rick try these as I am getting
better results with them than I did running CO2 through the filter intake, and
I'm getting close to 35 ppm CO2 into my tank; a drop from 8.1 to 7.2 in water
with a KH of 16. They work great for me. Rick, you might try mixing some
cheap bakers yeast with the wine yeast. I found the wine yeast takes longer to
get going and never gets as high a ppm but does last longer. I'm mixing a
highly recommended wine yeast with my Fleishman's. BUT, to get that 35 ppm or
so, I'm heating my yeast bottles to about 85 degrees. Even with the added
heat, the individual bottle will last 2 weeks and I just change one of the pair
a week.