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More on Ammonia
Ammonia which is lethal can be converted to ammonium which is not lethal by
reducing PH below 7.0. Many "cheap" aquarium products use large amounts of
sodium thiosulphate to reduce PH thereby converting ammonia to ammonium.
Unfortunately, if your PH goes up the resident ammonium converts back to its
lethal form. Tropical Science makes a product (Complete Care) which breaks
the chloramine bond and then converts the released ammonia into ammonium
di-basic which is not sensitive to changes in PH. I don't know about other
products, but using straight sodium thiosulphate can be a problem.