I posted a while ago about one of my leo pooping runny stool with worms and then just died in the next day; I now had all my other geckos checked by the vet, it turns out that they all have round worms and coccidia (and may be something more). I woundn't have notice that they are sick if I have not got their fecal done, since they are all eating and putting on weights and have nice fat tails. Their stool also looked fine to me too.
I did use sand as substrate (I don't anymore), but I do remove their faeces as soon as I notice them every night. The vet told me they probably had the parasites when I got them, or they might have eaten contaminated food. I raise my own mealworm colony and fed them mealworms as staple; only offering crickets (bought from reptile shop) like once or twice a year, I am worried that the crickets are the intermediate host. What shall I do? Crickets are supposed to be more nutritionous?
Is there anyway that I can assure that the crickets are free from parasites? Keep and feed them for a week before giving it to my leos? will that help?
Thanks.

