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@beanbag, Anything that is likely shrimp safe is probably not going to harm these "Shell bugs" either. Have you tried anything that is not safe for shrimps, but in super low doses? That might kill the shell bugs but not the shrimp. Here are some meds, USE WITH CAUTION and only in a hospital tank for experimentation of this specific case, namely, to find something that will kill "Shell Bugs". Trichlorfon/Dylox is useful for treatment of: Hydra, Lernia (Anchor Worms), Parasitic Copepods, Monodigenetic and Digenetic Flukes, Fish Lice (Argulus), Leeches. Malachite Green - has some use in controlling protozoan parasites. Might work in this case too. Formalin - targets similar parasites like MG above. Often used in combination with MG. Copper sulfate products - like Cupramine. For treatment of freshwater and marine ich (Cryptocaryon), Oodinium, external parasites, fungus, shimmy, and even algae (especially in ponds). Kordon's Fish Therapy Bath - use of citrus oils (oils include citrus, neem, and lavender oils) to treat termites, fleas, etc. Lavender Oil also has repellent abilities. Neem oil is reported to be effective as an insecticide as well as some anti-inflammation properties, anti-fungal and limited anti-bacterial. A lot of meds target bacterial symptoms, so I have avoided listing them above. Good luck, and remember - Don't treat the main tank with this. Only use these meds in a hospital tank.