I was reading about ICH/ICK today just because I wanted to be prepared if anything ever happened, and I read that you can put about 1 table spoon of non-iodized table salt for every 5 gallons into a fresh water tank with no harm to the fish, and that this will be good at preventing ICK, encouraging fin healing if necessary, all kinds of things. In general salt helps heal wounds for humans and this is also apparently true of fish, even fresh water water fish.
This website though was a home-made website. Although, the person seemed quite knowledgeable.
This was also not in specific reference to Bettas.
Does anyone do this or has anyone heard of this?