Fish antibiotics are helpful to treat a wide range of tapeworms and bacterial infections in fish, and are available in capsules and tablets. We have a variety of medicines that you can choose from including Fish Flex Forte and Fish Mox Forte. Fish Tapes is a dewormer that can used to treat and control fish tapeworms in fresh water, aquariums and fish ponds. Fish Amoxicillin, Cephalexin and Penicillin are good to treat bacteria and each has special properties that are helpful in treating different diseases in fishes. Before choosing any of these medications, we suggest you talk a veterinarian to figure what would work for your fish and the dosage that you should give them.