Why would you waste your time floating. Especially if the fish was shipped. That fish is in a toxic waste dump by the time you get it. And the oxygen in the water is probably very low. You should get the fish out as soon as possible. and new water getting to it.
Think about it. Ok you are floating the fish so the water gets to be the same temp as the tank. That is the only possible thing that could be done with floating. But then you take the fish away and put it in a bucket on the floor and start dripping water into the bucket. I doubt you have a heater in the bucket. because there isn't going to be enough water in the bucket to start off with. So as that bucket sits on the floor for what 45 minutes, or two hours, the water will start to cool some, and then you will put it in the tank. So that is 4 temp changes. cool in the bag, then warmed up and the cool in the bucket, and then warm in the tank. In my opinion that is way too many temp changes in a short period of time, and will be very stressful on the fish.
As mention earlier, fish stores don't drip because their are too many fish that come in at once to try to drip. You realize how hard and how long it would take to drip 80 - 100 fish. Plus they don't care if just floating the fish is hard on them, and the fish get sick and dies a week later. They are counting on that fish being in your tank by that time.
