We all have a medicine cupboard for ourselves - over-the-counter painkillers, first aid kit, hayfever tablets . . . and so on. When things go wrong, your first port of call should be water changes. Often, doing daily water changes alone might be enough to resolve the problem. But it helps to have things on hand for when water changes alone won't get rid of the problem. Here is a list of some treatments to keep in the fishy medicine cupboard. Tonic Salt Salt (tonic or rock salt) is a good, safe, general treatment for various different problems, including whitespot and wounds/fun damage caused by aggression. There's even some evidence that salt will successfully treat columnaris as the bacteria causing it is intolerant of salt. Methalene Blue General antibacterial. Helps minor infections and wounds to heal. API Melafix and Pimafix. Melafix is the equivalent of our TCP. Active ingredient is Tea Tree oil. Pimafix is a gentle anti-fungal. They can be used together to increase their efficacy. Active ingredient is Bay Tree oil. Malachite Green Treats protozoa and fungal infections. Often the active ingredient in whitespot treatments such as Waterlife's Protozin or King British's Whitespot Control. Anti Internal Bacteria Such as King British Disease Clear or Interpet's Number 9/Anti Internal Bacteria+ If anyone else has any suggestions they'd like to add, please feel free to comment.