Yea I don't know whats going on in Brandford but here in BC fish are not quarantined at the store. Most are for sale the morning after they arrive off the plane around here.
QT done properly is a great idea but most don't do it properly. The idea is a less stressful transition to your DT with a fish that is eating well and doesn't have parasites.
I tried a 20 gallon QT and think the stress of the stark small tank was causing more stress than good but I set it up because I brought in a Powder Brown tang that had marine velvet and it wiped out my entire tank, killed every fish in 7 days. Had I QT'd that fish, saw it had velvet and either helped it or let it die in QT I would have saved my entire population but back then I wasn't and I paid the price.
QT is not dumb nor started by idiots.
If I set up another (no need now, my tank is stocked) I would go for a 50 gallon bare bottom with lots of stuff to hide in. Keep the fish feeling safe and give it some room to move...
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