or fin rot?
handd_1999 - The treatment is to spot treat infected areas with gentian violet, bought from the pharmacist. After 3 treatments twice a day and daily water changes with extra salt the fin rot should be gone. Gentian violet is used for treating mouth fungus in babies, and usually not out on the shelves. It is in liquid form - just leave the betta in a net and applied it with a clean q-tip. Waited a few seconds and put it back in water. It dyes fins, but it comes off easy. Blotted the GV...didn't wipe or rub across fins. WARNING...make sure you aren't wearing anything you care about. If they start flipping in the net the stuff goes every where... - Dec 12, 2000
http://www.bubblenest.com/betta-fish/he ... lth-13.php