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several months later update: Somebody mentioned to try praziquantel as it is shrimp safe and is intended for "things larger than bacteria, but not crustaceans". All I can say is that in a test dish, with a shrimp molt shell which has these bugs, a dose (I forgot how much) does not seem to have an initial effect, but eventually all movement stops after about 3 hours. (normally I can still see movement 12 hrs later without treatment) A fellow copepod that was also in the test dish seemed unaffected, so that's good. They also mentioned metronidazole, which is anti-protozoa, but it's unclear if that's shrimp safe. Maybe an experiment for later... Well anyway I mention this because now I see some Golden Bee shrimp with the short antennae and lethargic behavior. (Tank has some new problems, will discuss in a different thread) I did a half dose once, and unfortunately a molt shell from a few days later still has these little bugs. However, they do seem much smaller at least. (I missed them the first time and prematurely declared victory) So either it "doesn't work", or maybe I have to dose twice a few days apart like it says in the instructions, or I need to do a full dose, or... That "somebody" also mentioned the idea that maybe these bugs also live in the detritus / debris of a shrimp tank, and thus it is advantageous to run a tank at a ridiculously low pH to minimize debris, bugs, bacteria, etc. Food for thought, and also some other thread... Just putting this out there for the public record.