I've tried Epsom salt treatments, Maracyn II, & Jungle Lifeguard.
Since the death of my 1st fish, I've been all over the board for the best cures. I've discovered that, once infected, there isn't much you can do.
I'm just waiting for Red & Shade to die. That leaves me w/ 3 girls (Spark, Mist & Tang) that are eating & look pretty good. (Butch is alone in a 10 gallon & lovin' it.)
I'm going to wait another 3-6 months b/f adding any more bettas, and than I will buy them from a BREEDER & no more petcosmart fish for me!
4 bettas: Butch, 3-year-old violet male PK EE & 3 girls in a 30 gal sorority. I do not name the girls anymore! 1/2 of them die within a month.
30 gal: 9 Oto cats, 4 Ocellifer cats. Inverts: Cherry shrimp & 2 assasin snails.
10 gal.: Butch, his 5 oto cats, 3 assasin snails, and a few snails the assassins haven't caught.