I have used it only because I had no other option. If you opt to use it, do not overdose - maybe even underdose. The main ingredient is from a tea tree oil and that oil is what supposedly damages the laberynth organ.
Personally, I am septical about all the deaths it has caused. Most people are uninformed on how to care for a betta so I highly doubt they would be able to accuretly diagnose a sick fish and feel that the fish they claim was killed was already past the point of no return or had something like columnaris and obviously bettafix is not a cure for it. That being said, I would not recommend it's use although many people claim it is a miracle cure. Supposedly the same oil does wonders for various human ailments or so I have heard on here.
My guess is - his issues are realted to poor water quality in his cup and as already stated - clean warm water is the best cure. Give him some time to adjust and you don't really need AQ salt to repair fins. Clean, warm water will do the trick - stress coat will help fin growth. If you do want to use Aquarium salt - its 1 teaspoon per gallon, premixed and do not use for more then 10 days. You can use less if you perfer. I thin the API box says 1 teaspoon per 5 gallons. It may help his gills as well as any fin rot he may have.
Last edited by Tikibirds; 03-08-2013 at 10:20 PM.