Hello! Im considering getting some vermex for my 6 mo old bantam cochins and silkies. They have been wondefully healthy but I have not dewormed them and want to have something on hand for prevention or if a problem arises. Im also interested in Flubenvet as there is no withdrawal period but it seems it is only available in UK. Is that right? Any product tips for prevention? They do free range a bit, eat snails, earthworms, and have occasional exposure to wild birds. I dont want to randomly throw wazine and species specific dewormers at them without a confirmed problem. Looking for something more broad spectrum and well tolerated. Thanks!!