FishNoob wrote,
the store we're going to says they quarantine all their
stock for two weeks before selling it.

That's how it used to be here in the US some 40 years ago - any more I
don't know of any fish store that quarantines.

In that case, do most of you
still quarantine after purchase?
If we're going to quarantine, how long would you quarantine for?

If in fact they do quarantine for two weeks, do they do any kind of
preventive treatment(?), or do they just treat the fish that shows
symptoms of a disease or parasites? The reason I ask, wild cought and
pond raised fish often have red worms (camallanus), that may not even
show up for 3 or 4 weeks. I do a quarantine preventive treatment; Feed
a medicated food for 10 days - 20% water changes per day for 4 to 5
days, add a teaspoon of salt per 5 gals. (stimulates slime coat), two
day treatment with Fluke-Tabs (treats flukes and worms), and half dose
treatment of Rid-Ich for 10 days (for skin parasites). Quarantine
preventive treatment takes 3 weeks............ Frank