I don't quarantine, and never had any problems. I however buy my livestock and most corals from reputable LFS.
For example, Gold's in Calgary does all the work for you and will treat any fish needed, also won't let any fish go until they are fully eating. So I have needed no quarantine.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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