Originally Posted by rich e rich
Ok, babystarz, I'll do that. It's troubling because I bought this ig bottle of melafix.
I read of people that used it for this same purpose, and they said it worked fine. What are your thoughts?
Yes some fish manage to not get it into their bodies, but really it is dangerous in any amount for bettas because if it gets into the labyrinth organ (basically, it's a betta's lung) it can cause damage. The main ingredient in melafix is tea tree oil (a mild antiseptic, not an antibiotic) and if it coats the inside of the labyrinth the betta cannot breathe and may suffocate.
Stress coat is good to use, but it's also not an antibiotic and you can use it in conjunction with a stronger medication to encourage a healthy slime coat, which it important for keeping your fish's scales and fins healthy.
Maracyn II is a gram negative antibiotic that is safe to use on bettas, although not the only one available. Various strains of fin rot are resistant to certain antibiotics, so if one antibiotic does not work you can attempt to use another. I do know that some strains of fin rot are entirely treatment resistant but this seems to be rare. Here are some other antibiotic choices:
The majority of aquatic diseases are gram negative which makes treatments with antibiotics such as Kanamycin or other gram negative antibiotics a good choice, this is no guarantee that the disease pathogen will respond. Sometimes combinations of Kanamycin and Nitrofurazone give a wide spectrum treatment, other times you may have to try very different antibiotics such as Erythromycin or Metronidazole (Erythromycin is often a good choice for usually aerobic gram positive eye infections) while Metronidazole is sometimes a better choice than Kanamycin or Minocycline for anaerobic gram positive bacterial infections with the side benefit of mild effectiveness for internal and some external parasites.
Usually the use of antibiotics is discouraged unless conservative treatment has failed or is inappropriate given the severity of the situation, and I believe this situation is indeed severe enough to warrant bringing out the big guns to make sure the bacteria causing the rot is dead.