Adding baking soda to provide correct kH
for entire cycle:
To create 7.14ppm
10mg/L OR 37.8 mg
PER L/G PER ppm
16ppm ammonia in a 20g aquarium. 37.8 mg
* 16 * 20 = 12096 mg
or 12.1 g
8ppm ammonia in a 70L. 10 * 8 * 70 = 5600 mg
or 5.6 g
This does not account for the pH drops due to acidity created by the bacteria. For example, this cycle I am working on stalled because of a pH crash, but I had not finished using up all of the kH
. So it didn't run out of kH
- it first produced so much acidity that it overwhelmed the buffer and dropped below the level of nitrification. (confirm?)
Papers on nitrification simply advise a general 10:1 ratio. So instead of doing 7.14ppm, we just add 10ppm per 1ppm ammonia. This amount is
/L per 1ppm ammonia, OR 53 mg
/g per 1ppm ammonia.
So in my test cycle for example, I should have added, to start, 53 * 16 * 20 = 16960 mg
= 17g of baking soda. 1 tsp is about 5 grams. You can see back on page 1 that I added only 1/4 tsp baking soda to the initial setup. I did not add more until the pH crash.
SOLVED! We can do the set it and forget it. OMG! I have to find something else to cycle!!!
I will start something new on Saturday after my big project is due.