No matter where you get your shrimp, I would always quarantine them. I generally pour mine into a jar and scoop each shrimp one by one with a tiny net. It's not 100% perfect but I am on the lookout for scuds, planaria and other craziness. Sometimes I'll even put a few baby guppies with the new shrimp in whatever container I am housing them in....this ensures that they eat any craziness that might be in there so I don't scoop it into my tank. I am terrified of getting any surprises especially since my colony is flourishing.