They should be OK to just dump in, but if you want you can do an accelerated acclimation process by floating the bag for a while and adding some tank water. It certainly won't hurt.
I just purchased 2 bags of copepods and mysids from seawater express. I just dumped half a bag in each of my tanks and have been doing this about 3-4 times a year. So far I haven't had problems.
Just make sure about your source. I like to go w/Seawater Express because he is a hatchery and this is the specialty.
Another good source is seahorse source. I have purchased from both w/no problems just dumping into tank.
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