Hey, berry. Its best to stick to one thread otherwise we loose track of what is going on.
You are going to have to set up a hospital tank in order to treat this fish. It needs antibiotics. When you say the fins are "falling apart" what exactly does that mean? Are they stringy and coming off?
If you are willing to set up a hospital tank, you can get help with that by reading the FAQ section stickied at the top of this forum.