It seems that a number of my fish have got callamanus worms. I have been looking on the web and the recommended treatment is levamisole, however the only one i can find is to treat birds. I know i'm going to lose fish but i've read that the worms spread through the tank so need to treat to stop the spread and hopefully save as many of my fish as possible. Does anyone know where i can get treatment for the worms, or whether i can use the one for birds if i alter the dose?? I can't believe this is happening, i've never had to deal with any illness this bad before so i'm really worried that it's going to wipe them all out. The affected fish are all bettas, mostly females, however one of my males appears to have them as well. Any help would be greatly appreciated.