Source of fish....
One other thing that bears consideration is where these fish are coming from... A lot of times, fish stores have a "turn and burn" policy. I have seen a fish store that was infected with ich, and the
entire water supply was central... that meant that there were a
lot of parasites present. Now, when scooping out a fish, (especially if he's a hard bugger to net!)

they can immediately start "shedding" or sliming due to the stress. Put this with the volatile combination of literally millions of little tomites swimming around.. and one, just
one can easily attach quickly. In this way, you can see how a fish that might "appear" normal and healthy can quickly "pick up the bug" at the time of purchase.

If you have a fish store with infested waters, that's not good. Some stores have individual tanks/water supply, but some do not. Some "claim" to quarantine, but most do
not. I personally know of a store that "claims" to quarantine, but I've been there on "shipment" day when the store was "closed" and before they open... voila, there has been an "open and drop" of the new fish.

Not quite fair, but who has to explain that running a store is a "business" for most LFS owners, and a successful business is a profitable business... and, well... You can fill in the blanks...
So it might be worthwhile to know the
source of all these fish. I would not buy from infested tanks. Sure, the parasite is most generally in all fish stores... and one bugger is as bad as a thousand... but there is something to be said for a massive occurence.
In your situation, I'd definitely starve
your tank, and then quarantine for sure. Making a fish purchase should be a big deal. A fish is something you can easily plan on having for a number of years. It is worth it to go through a couple of weeks to ensure a healthy fish goes into a healthy tank. I've kept ich-free tanks, and I can
guarantee it can be done... I'm not meaning to sound pompous, vulgar or arrogant,

but I need to be forceful in saying it
CAN be done. Is it a lot of work? Sure. But is it too much of a pain? I can't say it is... Reading some of the exploits/deaths/expenses incurred by some folks always made me glad I took the extra time. And that means
NO fish store water goes into
YOUR tank. It might mean a few more steps of acclimating, but again - well worth it, and I think you'd agree, especially after going through the hellacious experience you are enduring now!

Maybe someone can be so kind as to link that big "ich" thread in which I wrote a book.

There was a lot of good info from a lot of people, I think... a good read for where you're at right now. Good luck, may patience prevail - and diligence be rewarded!
