Melafix (a proprietary name) is an all-natural aquarium antibiotic consisting of tea tree oil. It is a wide-range antibiotic product, and thus is effective for a wide variety of bacterial and fungal infections, such as fin rot and body fungus.
I have only needed to use Melafix once in all my 20 years of fish keeping and when I purchased it I found it to be quite expensive, however I did find it very effective. After doing a bit of reading on the internet i found out that alot of fish keepers make their own Melafix solution so here it is. Use the following solution at your own risk. However with that said i have not read of any deaths from this solution and fish keepers all over are using it as a cheaper alternative to Melafix.
100% PURE Tea Tree Oil (Melaleuca Alternifolia) and some Distilled or De-chlorinated water.
Read more about Tea Tree Oil
You only use 1% of Tea Tree Oil to 99% de-chlorinated water, for example if you have a 200ml bottle you would add 2 drops of the Tea Tree Oil. Always use a new clean bottle and know exactly how much it holds, or you can make it up in a jug and pour it into a new bottle if you are unsure. Shake your solution for about 10 minutes which helps the oil to mix. Once you have made up your solution you then use it the same way as you would use Melafix. Make sure that the Tea Tree Oil is 100% pure.
MelaFix Directions for Use:
Shake well. For best results, remove activated carbon during treatment. As a disease or wound treatment: Add 1 tsp. (5 ml) for every 10 U.S. gallons (40 L) of aquarium water. Repeat dose daily for 7 days. After 7 days, make a 25% water change. Treatment can be continued if necessary. When adding new fish to the aquarium or when netting and handling fish: Add 1 tsp. (5 ml) for every 10 U.S. gallons (40 L) of aquarium water. Repeat dose daily for 3 days.
USE THIS SOLUTION AT YOUR OWN RISK. MALAWICICHLID CAN NOT BE HELD RESPONSIBLE FOR ANY LOSS OR DAMAGES CAUSED TO LIVESTOCK. If you are unsure there are a large number of websites covering this topic.