I use the drip method, which is usually what the online vendors tell you to do. If you introduce things in to the tank without weening them on to the water in your tank, you could possibly shock them. And shocking leads to stress(alot) and then stress *could* lead to death. In my last tank, whenever i added coral i drip acclimated them for an hour. Never had a loss or problem with any of my coral and i drip acclimated SPS, LPS, polyps, and softies.