I now always quarantine for 2 - 3 months. My last 2 times, lasted 3 months in total each. It takes that long just to go through the hypo salinity routine (which I now do whether or not the fish looks sick). Plus that time is well spent getting your new fish feeding well, and being strong before having to face their new tank mates in the display tank.
I have a QT ready to go all the time now, with a canister filter that is fully cycled. I change water using my used display tank water, so no extra salt costs.
It can also be connected directly to my DT and used as a refugium. At the moment, actually, I am using it to cure/cook some new rock. So always handy to have a spare tank ready to go when you need it.
I learned my lesson a year and half ago, and don't want to have to go through that again. I can't afford to risk my display tank, and have to tear it apart to catch fish that are sick.
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