So it's been over 2 months and looks like my good old friends the camallanus worms are making a long-awaited comeback in my 55 gallon. I had euthanized the 2 fish that had them (both of which I had ordered online from wetspot tropical fish, do not order from them unless you want camallanus too), and treated the tank with fenbendazole. I thought I was out of hot water after that, but apparently not, as now my firemouth is showing symptoms. Clearly fenbendazole doesn't work, and I've heard good things about levamisole HCl for treating this parasite. However, I live in Canada, and it doesn't seem to be available anywhere. How can I get some? Is there a place I can order it online? Is there some other treatment I could use? I am kind of at the end of my rope with this problem.