Most inverts need a slow acclimation. Two methods are common. The drip method which requires airline tubing that you use as a siphon from the main tank to drip water into an acclimation bucket. The other method is to add 1/2 cup of tank water to the acclimation bucket every 4 or 5 minutes.
Both methods should start with temp acclimation by placing the closed bag in the main tank for 15 min. Then you can start the acclimation process that will last about an hour.
Others will have varying opinions about times needed to acclimate but the 1 hr has worked well for fish, shrimp, crabs, snails and corals for me.