Hello my friend!!! If the fish is eating, it can be given a very small portion of food. However, as the treatment is relatively short, I wouldn't feed them during those days. The food you give them may not be consumed and will pollute the water and when they eat they will defecate, which will also pollute the water. I recommend that you don't feed the fish during the treatment. It don’t hurt the fish.
Hello my friend!!! You can use the treatment in this video to treat your fish. However, if you can't find these medicines, as they require prescriptions, you could try OCTOCIL from Manaus, which also treats intestinal flukes. I have a video with this treatment (octocil): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oSpB6qNp6_g.htmlsi=rw6Uh_Zn3qB7Hi-6