Ill try to answer your questions - without typing everything out
1. The LFS
2. Yes 2-3 weeks
3. They have a room for quarantine.
4. They have dates on all the tanks - so that would not happen
5. They have a lot of tanks - in an isolated room.
Wow, you're lucky. no such LFS like that around here.
My LFS has 4 banks of SW tanks. 1 bank is separate system and running copper, the other 75% of the tanks are copper free. About half of the copper free tanks holding fish also hold inverts. (!)
When they get a shipment of fish in, they float and inspect the fish. Any with
obvious issues go right into the copper system. Those not showing any
obvious issues get put into the for sale/display tanks running no copper. The same tanks are also filled with inverts that are for sale. If any fish in the for sale/display tanks begin showing issues, they will get netted out and relocated into the system running copper. I'm often browsing the tanks and spot fish with issues in the non-copper tanks. which means any fish in that tank is also likely a carrier or infected.
All of the tanks are "for sale" tanks including the tanks running copper. You can buy any of the sick fish in the copper systems. They don't even mention that these fish are sick, or why they are in copper systems. This bank of tanks just have "copper in system" written with a sharpie on the tanks. That is your only warning that the fish are sick. All these fish are still for sale. If you buy one from these tanks I doubt they tell you how long the fish has been in copper or how long it should remain in copper. I'm pretty sure you are on your own with any of these fish and any repercussions of taking one home and dumping it right into your display tank... UGH!
They treat sick fish in copper, but all their other fish are carriers too. Same with all their inverts housed in the same systems that have sick fish coming and going daily. they just pluck out the
obviously sick fish, leaving all the others untreated.
Not QT'ing any of these fish or inverts would be a huge mistake.
I find it hard to believe 95% of LFS's don't run the same way. If anybody is lucky enough to have an LFS that doesn't run this way, my hat is off to you!!
The next closest LFS to me is about 90 minute drive. so 3 hours roundtrip to go to any other LFS. Suffice to say my LFS sells a lot of fish and doesn't have any incentive to do things much differently. They don't offer any kind of live guarantee let alone credit/refunds.
I still buy my fish there, but make sure I QT everything very thoroughly myself.
I have purchased fully QT'd fish from Dr. Reef before too, and that was a great experience. Would do so again if he had the fish I wanted, when I wanted them.
I have 4 fish in my QT tank now.
(3) were ordered from Tankstop.com and were added to QT back on 3/29.
the fourth and last fish was an anthias purchased from my LFS above from one of their copper free tanks and added to my QT on 4/2. these fish all underwent 30+ days of copper, multiple prazi treatments and are now approaching 50 days in QT, set to be released in another 10 days or so.