If your fish's fin rot does not improve within a few days of cleaning and treating the tank, you may want to try antibacterial fin rot treatment. You can find this medication over the counter at your local pet store. Look for fin rot medication that is made for your type of fish, such as fin rot medication for a Betta fish or a goldfish. Follow the dosage directions on the label.  These medications often contain antibiotics to kill off the fungal infection, such as erythromycin, minocycline, trimethoprim and sulfadimidine. Make sure the fin rot treatment does not contain any organic dyes, as they can be toxic to certain fish. Popular types of fin rot treatment include Jungle Fungus Eliminator and Tetracycline. You can also use brands like Maracyn, Maracyn II, Waterlife- Myxazin, and MelaFix. An alternative to commercial medication is the use of tea tree oil and salt. However, tea tree oil is not considered a reliable treatment and should be used as a preventative measure rather than a cure. You may need to supplement the tea tree oil treatment with antibacterial medication or antibiotics.  You can add a one to two drops of tea tree oil to the tank water to keep the water clean and sterile. Make sure your fish do not react negatively to the tea tree oil before you add more to the tank the following day. Tonic salt, or sodium chloride, can also be used to prevent fin rot. Add 1 ounce salt per gallon of tank water. Only use tonic salt on salt-tolerant freshwater fish. When you treat your sick fish with medication, you should supply extra oxygen so your fish can breath. Medications tend to leech oxygen from the tank water so you will need to give your fish some supplemental oxygen to keep him healthy. Set up an air pump, an airstone, or aquarium housing in your tank to inject more oxygen into the water.  If your fish is a Betta, set the air pump on low so the current is not too high, as a high current can be stressful for Betta fish. You should only use the medication for the duration of time specified on the...

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