i saw this pasted on a filipino board
(not that I'm filipino, so I'm lucky it was in as much english as it was)
Methylene Blue. Read ingredient dapat Methylene Blue kasi iba me Copper Sulfate tepok. Now use as directed pero pagdipa madilim you can add more. Basta Methlene Blue ok iyan.
Next betadine in cotton. Pisa mo. Cotton should be dry. Swab affected affected kasi basta fungus iyan dead tiisue na. You remove it quickly. Avoidly eyes gills. Pwede fin skin only.
Add a little salt.
Methy Blue will kill good bacteria so separate it pail and use new clean cotton fiber sa ohf.
3-5 days ok na.
After that WC and return old cotton fiber good bacteria. Add salt again. No more meth Blue.
if you can figure out what they're talking about you'll be ok :D
the other thing is that I read people saying
that no matter what you do regarding fin rot, you have to be careful because the erythromycin or other chemicals you decide to use can totally botch up your tank, so if you go natural, or can go natural, you're probably better off
it's funny, when i was in London once I was thinking to get my ear pierced (cartilage not lobe) and they said to clean it all you need is salt water, so it's kind of funny thinking about fish rot cause well, they live in salt water, I wonder if fish in salt water get fish rot
(then again if i pierced my ear cartilage no way I would use just salt water, it's Dial and Bactine for a good American) :P