Depends on your level of caution and what you want to avoid.
Snails, I just drop them in but I guess there is a chance that someone rides in on their shell?
Coral - I dip every one to kill pests. Dip dip dip!!!
Fish - I was a quarantine kinda guy for a while but had very little success with it. I now just drip acclimate for 3 hours and add to my main display. I will only add a new fish no sooner than a month after the last one. I find if you take it slow and only add really healthy looking fish, you can avoid quarantine but that's my personal thought on it, I'm sure many people have great success with quarantine set ups. For example, I've wanted a blue tang for a long time. I won't buy one that just got to the store, too many chances of it being ill. I won't buy a small one, wont buy a skinny one, wont buy one with a lumpy belly, won't buy one from a tank that has even one spot of ich. I'm just super careful, it actually took me over a year to find one I'd try.
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