hi,praziquantral is a good med for flukes.metridonzol is good 4 int parasites.i use 2 have discus so these were used.look up dose rates first as i dont remember them.could your oscar have something lodged in his throat?i lost a lovely festae which choked on a large live shrimp once.one more thing,live food thats from a clean scource is a good way 2 get fish eating & dont med ur fish 2 much as some meds efect others so try & allow time between meds.good luck.