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Yup they're in the shrimp tank. I will talk to the owner.Definitely planaria. Not too concerning if your lfs having fish in that tank but they are a big killer if the tank has shrimps. They wiped out my extremely expensive taiwan bees colony in no time. They grow very fast as well and they can be very big. Your lfs need to take it very seriously or else he may have planaria infestation in his store if one of them goes to other tanks with nets or something. There are many ways to kill planaria. Medicines available which are shrimp safe.