If you have the goldfish in a bowl, you should get it at least a 10 gallon aquarium with proper filtration. Septicemia is pretty serious and is most likely caused by poor conditions in the container the fish is kept in. This is probably due to overfeeding and lack of maintenance. Imagine, if you will, that the goldfish is living in your toilet. Not a pretty picture. Provide him with a well-filtered aquarium and he will possibly get better. Septicemia is difficult for animals and humans alike to recover from.