ER may be more going on HI,
Many times in freshwater we only worry about NH3 and nitrates, but another common problem is PH shock from biological filters.
What works for me is to prevent the PH spike by adding a small amount of crushed coral to a media bag in the filter if the PH drops to 7 or lower a small amount of the buffer in the Calcium carboante will be dissolved this can occur in freshwater much easier than salt.
So maybe only 2 table spoons of that calcium carbonate (crushed coral).
I have used this for the past 20 years in all my fresh water tanks.
My africans of course but most liver bearing fish need stable PH and many of the freshwater cichlids can handle a higher pH if there's no PH crash.
so in closing most problems are really loss of carbonate in the water due to metabolic uses by bacteria this results in a PH crash this will kill more fish than NH3/.
Doug
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