Sure, but their survival rate will depend on the tank already having excellent parameters and very slow and careful introduction, as well as something to eat once they're in. Some people acclimate by adding small amounts of tank water to the water they came in (assuming temp. variations and correcting), then let them individually cling to the top of the tank at the water line so they can get used to it all.
Dumping them in all at once is a no-go.