I usually float for 15 minutes, open the bag and drip acclimate for 30 min tops and then scoop the fish out and into the tank. This has always worked for me, but my last shipment I screwed up and accidentally dropped a yellow tang into my sump shipping water and all (after the 15 min temp acclimation). I thought I would lose him for sure, and ran fresh carbon to counteract the shipping water in my tank, but... nothing happened. He’s just as healthy and happy as the other two tangs that went through the drip acclimation. Now yellow tangs are generally hardy fish to begin with, and so I’m not sure if that had anything to do with it, but he’s alive and healthy. Can’t really argue with the results.