Toxicity also depends on the exposure time. It's not like you submerge your your hand into the medicated water all day long, or take a bath to cover your whole body skin, so the exposure time and area of contact are tiny.
Whenever medication threads comes up, there is always hyper against using toxic chemicals. All medications are toxic. It is supposed to be toxic to the pathogens, but not to the host, and that's how medication works.
There were similar threads on ick treatment. A lot of people were hyper against using malachite green because it is toxic, but it is exactly its toxicity to make MG 100 times more effective than mild salt and temperature treatment.
Whenever medication threads comes up, there is always hyper against using toxic chemicals. All medications are toxic. It is supposed to be toxic to the pathogens, but not to the host, and that's how medication works.
There were similar threads on ick treatment. A lot of people were hyper against using malachite green because it is toxic, but it is exactly its toxicity to make MG 100 times more effective than mild salt and temperature treatment.