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Drs foster and smith sell a product called Fish Bendezole. It says it is fembenzedole. It is $7.49 for three 250 mg packets. That would medicate a bunch if food!
I always take his advice with a grain of salt, but Fishman claims Levamisole is "effective against most internal parasites, especially nematodes": https://www.fishchemical.com/FULL-PRODUCT-LIST-LEVAMISOLE-HCL-59551.Item.html
I believe fenbendazole replaced levamisole since fish will typically not build a resistance to fenbendazole (like they do with levamisole.) But if fenbendazole fails you, I would probably try levamisole next.