Yup that was me - still have the photos somewhere! :) You might be right. Look on MH's parasite page though, you'll see photos of what is probably the closest I've seen. He calls them flukes and egg sacks or something. Hopefully I can send them off to be tested. At least it would solve the mystery, since lots of us here have them. I can't do a flush for at least a few months though. Got some other health issues taking priority.