I treat my Bettas a bit differently if they get finrot. It usually only happens if I have one that bites his caudal, or they get their dorsal caught in the overflow holes in the drip system containers. If I don't start treating right away, finrot can develop. I put about 3 inches of water in a beanie container, and add 1 tablespoon of aq. salt. After it has dissolved, I put the betta in it for 15 min. This will kill the finrot parasite faster than anything else I can do. Then I put the betta in a beanie of clean water, that has the normal 1 tsp. salt to 5 gal water mixture. I use this on all my bettas. I add melafix, 10 drops to 1 gal water mixture, and 1 mil. of IAL tea. I use a syringe to measure my meds. I personally feel that more water changes is the key to healing any illness, so I do 100% water changes daily on any small container with bettas in them. I re-treat every day until the finnage shows signs of re-growth. If you do more water changes, you will find you have less problems with your bettas. One of the keys to growing out HM's, is to do water changes as often as possible. It only makes sense that if water changes grows better finnage, then water changes should keep that finnage healthy. I rarely have finnage issues, and it is because I put out the daily effort of keeping their water as clean as I can. The only way for you to know this for sure, is to try it yourself for an extended period of time.