Anyone here freshwater dip fish?

Just curious as to if anyone else does a freshwater dip to new fish before going in the aquarium? For anyone who does not know, it is simply placing a fish in freshwater for 30 seconds up to a minute or 2. This theoretically can cause osmotic shock to any parasites that are on the fish. In 10 years with my big tank running I have never put a fish in the tank with out a Dip first. Have seen bubbles come off the fish more then once and sometimes the gills. Never seems to bother the fish if all the water is the same temperature. BIG KNOCK ON WOOD HERE but never had Ick once. Never used a quarantine tank.



Now I am not claiming anymore science here then osmotic shock theory. See lots of threads about people with fish disease. Wonder if others with some more education on this subject could chime in and help out.



So, anyone else do the dip? See people dipping corals but no talk about fish.