As a new reefer I am grateful for this point of view. I know how much of a rabbit hole things on forums can be, and this alleviates a lot of the stress of worrying if I'm doing the right thing. Thank you for this.
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I also don't think your vet would appreciate your throwing him under the bus by saying he claims a fish with Ich cannot be healthy. A simple google scholar search of "immune response to cryptocaryon irritans" will quickly show that he is denying science.
Final thought in light of the recent Columbus Day holiday. A bunch of healthy Europeans came to the new world and brought with them smallpox and other diseases that devastated the native populations. Despite what you and your vet think, this did not make the Europeans unhealthy.