Yes. To acclimate a fish, snail or shrimp you float the bag for ten minutes or so to equalize the temperature. Then every 5-10 minutes add some tank water to the bag. Continue until the water in the bag has doubled. Net the animal and release into the tank. Discard the bag water. Don't tip it into you tank. Doing it this way stops the animal being shocked/stressed by the sudden change in water conditions from the bad to the tank. There is another way called drip acclimatization. There are videos on YouTube that explain that.