For fish i have a Tank transfer set up, 2 20gallon tanks 2 separate everything heater, pump, PVC hiding places, HOB filter, (sand box if there are wrasses) Ammonia badge.
And usually do Prazipro treatment after.
For corals careful inspection dips usually only buy small frags (mostly cause I'm cheap but i do like growing stuff from small) and for the most part i take it off the base but not a habit
Heres my last round of QT (and no the leopard didn't make it through dam finicky fish)
After having ich once i never want to go through it again should had this when i started