Many dealers and vets seem to default to "shotgunning". In other words, they give the cham one of the general deworming meds like Panacur or Flagyl without doing a fecal analysis first. I think that's a bad idea for several reasons. If the cham doesn't have some parasites the med will treat, you are poisoning it for no good reason. If the parasites the cham has are not sensitive to the med, you still poisoned your cham for no good reason and will have to treat again with the right med. Most chams will have some parasites no matter what, as most feeder insects carry some. I don't think it's possible or necessary to get rid of all parasites. If the cham is eating, drinking, acting normally, is good weight and has no other health problems the parasite load it may have is being tolerated well. Also, freshly imported chams may suffer a bloom in parasite populations as they have been under stress from capture and shipping. But, treating heavy parasite loads can also kill the cham by overwhelming it with dying or dead parasites blocking the intestine, lungs, heart, or causing secondary infection.