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Here's another place for medicated food, works good if the fish are eating & will eat flakes. I recently had to treat my panda garra & histrionicas with them for a bacterial issue with the kanamycin flake.
I used the fenbendazole flake with my juvie discus seemed to work as well but their issue was slight ( sometimes white poo)
http://www.angelsplus.com/MedsParasite.htm
While I was ordering I got the metronidazole flake too, discus sound like they're bound to need it sooner or later.