This is answered comprehensively here. Also question is, can Bettafix kill my fish?
Often, it seems, people who claim melafix or Bettafix killed their fish are beginners . However, I have used Bettafix at it's normal dosage without any ill effects in a well cycled and monitored tank.
Subsequently, question is, what is Bettafix used for? Use it to treat ulcers, mouth fungus, fin and tail rot and when you see signs of bacterial and fungal diseases like red ulcers, slimy patches or cottony growths. It can also be used to help heal wounds and tissue damaged by handling, netting or fighting.
Beside above, can you use Bettafix on goldfish?
This is helpful for goldfish and bettas. And Melafix/bettafix is pretty controversial in use with bettas. It MAY harm them. Fin rot is caused by bacteria in the tank.
How quickly does Bettafix work?
Simply mix in half of a teaspoon (2.5 ml) of Bettafix into every gallon of water in the aquarium. Repeat this for 7 days. After 7 days, replace the water in the aquarium. If the betta fish is still not better, you can repeat this for another 7 days.
