If you read Paul's threads as I suggested, you realize all of those things and quite a bit more.
That's why I suggested reading them.
It will give you a perspective on what's possible and how wrong the typical methods are. It's wrong to think you'd have to emulate everything he does.
And the summary version always sounds nutty coming from you guys.
BTW, if you've never saved a fish with good feeding and healthy, low-stress living conditions, you're missing out BIG TIME. It's almost the only "method" I've used – even in a retail setting. Losses were consistently low and almost always related to a compromised bag during shipping, very rarely due to presentation of an illness during QT. I had none of Paul's methods available to me....just normal frozen foods (mostly whole-frozen mysis, krill and Rod's Food) with added AminOmega or Selcon along with a quality QT environment. Generally, that meant a tank no smaller than 30 Long, more often it meant a 50 gallon. A few small fish were QT'd in 15 gallon tanks.
I try to relate what has worked for me while keeping in mind that I still have a lot to learn.
People often forget many of the other things PaulB does with his system.
Meds are important, as is their proper use. But "some people" tend to forget all the other things that go into recovery and into keeping fish healthy in the first place.
For what it's worth, you can pick and choose what parts of Paul's scheme you want to emulate.....he's consolidated the best parts into his book. He's put some parts of that online at saltwatersmarts' blog....check out his entries here:
Paul Baldassano
Feeding live foods (or as close as possible to live) is a huge part of it. So is
feeding very regularly.
The core of his "system" is not exotic at all....to a large degree, he reefs out of a book published in 1954.
And that book wasn't all that far off from the original marine aquarium manual written in the 1850's. (Gosse)
What makes Paul's methods seem "exotic" is mostly just our perspective.
If you start hatching your own brine shrimp (which is easy) and keeping blackworms around (which is even easier), you're probably more than 50% there, for example.
Starvation (which, for ich, takes 76 days with no fish host available to the parasite - six weeks for velvet) ...
These numbers get repeated like they are gospel.
Let's try to remember that they are not. They refer to specific strains of these pathogens under specific circumstances.
We know there are exceptions.
To put it simply, there's no guarantee in either number. It's also nearly impossible to assure against other vectors for these pathogens. And what about other pathogens we don't yet know the magic numbers for?
It makes sense to take certain precautions, but there's only one answer for all those concerns...even after "cures" and "treatments" there's only one guarantee:
Healthy fish with healthy immune systems.
This means a lot more than exposure to natural seawater or specific pathogens....those ideas only refer to one aspect of immunity....let's not roll the conversation that far back.
If you must focus on only one aspect, focus on fish slime and what it takes to produce copious quantities of it loaded with the proper amounts of antimicrobials.
Here's an excellent local Reef2reef thread on the subject:
A discussion on immunity
And some other stuff if you can stand a little reading:
Fish Health Through Slime
Personal immunity versus social immunity
Immunological Control of Fish Diseases
Almost all of this has been gone over in detail in that Immunity thread....it's kinda long, so feel free to use the website's excellent search function to filter through it on specific terms to find a good starting place.