Dusty Fin Rot HELP

[BBgirl]

Well dang it. I finally get Rusty's fin rot to stop reversing and his healing is still going super well. However, Dusty had developed some. I started with salt baths and tetracyline treament No sign of improvment. Went to salt baths and now Fungus Clear but he seems to be getting worse.
I clean the bowl 3 times a week and it usually has a carbon in the filter (obviously not while medicating)

[Rain Drop]

try adding salt to his water too and bettafix?
Maybe ampicillin?

[BBgirl]

I always use salt in the water for all the fish. I have bettafix but don't think it's safe for him while he is in other medication. If anyone has used it with other meds safely please let me know. Dusty's gorgeous halfmoon fins are about half gone now despite treatments.
I unfortunatly can't afford other meds right now.

[AlexXx]

Make sure you give him a week break from meds. Like a week of meds and a week of just clean water.