Thanks! I will look into HITH. These came from a pond where the craws have white worms coming out of their joints, so I thought some kind of worm but I can't find anything quite like this on the internet. I've noticed the white parts are extending from the hole sometimes, and sometimes they are not so it's either a worm or pus. Super gross lol. I bought some praziquantel but I'm reading it does not work for roundworms and the like? I will do more reading on HITH