So you only did the temp acclimation? My preferred method is to float it for half an hour and then open the bag. I replace one fourth, or as close as possible, of the store water with my water. I'm very careful to keep my water and the store water separate except for in the bag. Let it sit for ten minutes, and then repeat. Repeat once more after another ten minutes. I will do this longer for more sensitive fish, but most are fine like this. If there isn't a very substantial difference in the temp, I sometimes cut the time of the first part to fifteen minutes, but it depends.
Courtesy of Dakota's iPod.