A Freshwater dip is suggested in many cases to try and flush/kill certain tissue issues. I am confident that a FW dip saved my FrogSpawn which was going down hill almost right in front of my eyes. I dipped it for about 5 minutes and then placed it back into the tank. Before I dipped I adjust temp to match the tank temp to minimize stress. I lost 3 head out of 5 because I hesitated on the dip (that's my story and I'm sticking to it) .