Glad it made sense! from what others are saying it doesn't sound like it's detrimental to the biological filter which is great! My guess would be that the ratio of good/N-bacteria is so much higher than the bad bacteria on the fish, the dosage is such that it's enough to kill the smaller number of bad bacteria without killing too many good bacteria as to damage the nitrogen cycle....Of course that's just my a theory
Good luck with your fish though! Glad to hear some of them are starting to eat again
