You cannot just dump them into the tank, they will die from shock(change in conditions). what you should do next time.
1. float the plastic bag in your tank for atleast 2 hr (stablise temperature)
2. Open up bag and poue some tank water into bag, wait for another 2 hr. ( Stablise water chemistry)
3. Slowly release them into the tank.
Also you need to make sure that the tank temperature is not more than 30C
Jack
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