Actually, I didn't do it again lol. Its all about how one reads the sentences you posted - and with copper - Its all based on concentration. And - Copper will at a certain concentration kill 'All' bacteria - at least those that live in tanks. My point was that at the concentrations used in QT tanks - at least many versions do not kill bacteria to a significant degree - but they will kill parasites. Thus - I do not believe your opinion as to the effects of copper on 'intestinal bacteria' in fish (which is I assume the bacteria you're talking about) is significant at the prescribed dose. After all we're talking about the risks of copper in QT tanks right?See Mn. You did it again. I said copper is a poison and it will kill bacteria. You added "all" bacteria. I didn't say all. Just like if I used weed killer on my lawn, I would expect it to kill the weeds, but I doubt it would kill all the weeds. Some weeds may be hidden behind something or not enough weed killer hit it. I also know napalm will kill people, but it doesn't always kill all the people. Not to many things are perfect. But does copper kill or disrupt gut bacteria? Yes it does:
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Copper does kill germs
Copper has antimicrobial properties, meaning it can kill microorganisms like bacteria and viruses. ... It interferes with proteins that operate important functions that keep bacterial cells alive.Dec 28, 2020
Does copper kill nitrifying bacteria?
Copper is also toxic to the nitrifying bacteria in the biofil- ter. ... By contrast, bacteria that can cause disease in fish are much more resistant to copper, with some only inhibited or killed at free copper levels as high as 1.25 mg/L (Cardeilhac and Whitaker 1988).
Where copper could be used
Currently, stainless steel or plastics are used for sinks, counters, beds and other surfaces in health care environments, but while stainless steel and plastic are easy to clean (the main reason they're used in such places), it also demonstrably harbors far more bacteria and viruses than a similar copper surface does — and over time, small scratches, dings and holes can hide even more.
It's especially important that the most dangerous superbugs, responsible for the death and illness of already-sick people, are killed by copper. That includes methicillin-resistant staph (MRSA); other staph bacteria; adenoviruses; the flu virus (all types); and even fungus. In a study published in the International Journal of Food Microbiology, 99.9 percent of E.coli bacteria was killed after an hour on a copper table, whereas it survived for weeks on stainless steel.
And you're also correct certain coppers can affect nitrifiying bacteria.