Hi Lauren a salt bath can be done for many reasons such as an ulcer,scratch,or infections like swimbladders what you need to do is desolve
3oz of salt per gallon in a tub big enouth that the fish will go in to and make shore it is all desoleved as undesolved salt can burn there belly and finns leave the fish in ther for 10mins ant then trancfer to a nother tub with just pond water befor it is put back in the pond this can be done every other day as long as the fish is not showing any sighns of getting to streesed if you go to your local koi dealer they will supply you with salt but dont get the salt from the supermarket as it has other chemicals in it but i also would highly recomend a scrape is done to see if there is any other parasites on the fish i did the same as you a while back just treated the pond withpout getting a scrape done and i endded up losing 5 fish due to this mistake one i will never make again hope this helps
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Hi im Dan and im addicted to Koi | 
