i am fairly certain that in my one tank i have camallanus worms. i have guppies, platys, cory's, angels, female betta's, albno bristle nose pleco in a 45 gallon planted tank. I have lost 5 or 6 female guppies they were old and i just added a diy co2 system and i thought that was the reason for there death, maybe stress. but now i have 5 or 6 more female guppies that i can see the worms sticking out of there vent. i have been doing some reading on this site and others and it seems that i need some Levamisole HCl. Is this the best treatment? can i get it in calgary? should i treat my other tanks at the same time? i do transfer fish between all of the tanks every now and then. all tanks have simaller fish. the other tanks show no sign of the worms. i do a 30-50% water change every week. the only thing i have done so far for treatment is added salt 1 tbsp per 5 gallon