Except for Gordon H, everyone posting a reply is in favor of quarantine and/or dipping, often because of personal experience. If done properly, I think the benefits greatly outweigh the negatives.
Maybe we should talk about ways to quarantine that reduce stress on the animals/corals. If done poorly, it may just add more stress to the anima or coral. I am always worried about plopping a fish into a newly set up quarantine tank with the potential added stress of the tank cycling. Therefore, I have a 44 gal tank always running with a filter, protein skimmer, and a few permanent resident fish. As a result, the quarantine tank is already stable. I do weekly water changes, alternating between new SW and water from the main tank. Before moving a fish out of the quarantine tank, I will do additional water changes using water from the main tank so the water in both tanks is as similar as possible. However, this requires additional time to keep the quarantine tank running constantly; but personally I think it provides the least amount of stress on new arrivals.
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300 gal starphire custom built in pentagon reef (+90 gal sump on Blue Line 100 HD return pump, 210lb LR, Euro-Reef RC250 skimmer, 2x400W MH, 2x28W compacts, 2xTurbelle classic 4002 pumps & Turbelle Stream 6100 on 7095 Multicontroller, running ZEOvit)
Livestock
Fish: damsels; sailfin, yellow, regal & naso tangs; ocellaris & tomato clowns; lyretail anthias; foxface lo; flame angelfish
corals: a few
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