I'm still pretty new to all of this, but it seems like people go to great lengths to acclimate their corals, slowly dripping in tank water over hours. I'd be a little bit nervous about suddenly exposing the coral to cold salt water, fresh water or iodine. Isn't that causing a good deal of stress to the coral? Obviously, you want to avoid bringing anything unwanted into your tank, but what are we talking about here? Pests like aptasia that I can kill off pretty easily as long as I don't let them get out of control, or is there significant potential for something worse that's not so easily erradicated?
Anyway, I'm certainly not criticising anyone's practices. I'm just genuinely curious about how stressful it is to the coral and what sort of risk I'm running by not taking any such preventative measures.