2 grams per 10gal is usually plenty. It will kill snails and may kill shrimp.
Panacur (brand name), Fendendazole (generic anme) is also used as a dog dewormer and easy to get at most pet stores.
ok so do you just put it in the tank? i didnt read that it created a "bath" like the other stuff does. I saw you had to soak food and it had to be digested. One dose do the trick?