The Bettafix did not improve my CT Betta's condition, in fact 4 days into the treatment he was lethargic with fins worsening. Four days now with clean water, he has shown improvement with his behavior but his fins have deteriorated. The pics show the progress of the fin rot, if that is what I'm dealing with. Maybe it is my 8.0 or so water hardness? Could hard water eat away at the fins?
He is eating well and was entertained for a while with a fly in his tank yesterday, so it seems he is on the mend, hopefully his fins will recover. Looks like now bones are visible on the ends.