I pretty much just use the two leads, but one could get creative, I suppose. One issue I had initially is the hand and foot electrical resistance. I'm thinking of getting or developing a footpad type thing with enhanced contact. I already made hand held things out of copper pipe. When I started, I did not have the nice electric pads with the conductive gel. Seems that 20V is pretty noticeable, electrically speaking when properly conducted with a pad with a lot of surface area.
Are you sure what you are dealing with is tapeworms? We have seen roundworms in our business, and am also confident we have been exposed to rat and mice feces as well. IDing the culprits would probably be helpful.