I'll share my method.
I start by floating to bring temp in line, then drip for at least an hour (usually 2 or 3). All new fish go into a 30 gallon QT setup that is filled with water from the DT and has LR from my sump for observation and acclimation to my feeding etc. If after a month there are no issues, then they go to the DT. If there is any sign of illness, then the QT is converted into a hospital tank for treatment (To convert QT to hospital tank, I replace LR with PVC before medicating, and then cleanse and dry the LR before adding it back to the sump)...once there are no signs of illness for a month, the new fish goes to DT.
I do use a social acclimation box for almost all additions (especially wrasses). I figure I want to see any aggression before releasing the new fish into the 180...it's no fun to try and remove a fish from a 180...