You need to stick to interceptor not flatworm exit. And interceptor will kill arthropods, that includes shrimp, crabs, amphipods, etc but it is also dose dependent. In other words, if you dose low enough, the shrimp and crabs will live but maybe so will the red bugs. The other issue is red bug eggs, nobody really knows anything about them yet. Some people advocate single dose interceptor and others suggest multiple dosing days apart. Anybodies guess as to how many days apart, but it seems like internet consensus is 3 to 4 days apart. And not sure if it should be one time dosing, two time dosing or three time dosing. It is a work in progress. At the least, one time dosing will drastically reduce red bug population whether it wipes it out is unknown, maybe yes, maybe not.