My betta has been sick for months now, I've been treating her with epsom salt and Kordon Rid Fungus. They seem to be keeping her alive, despite her very swollen abdomen and in ability to even see her food clearly. At a point her scales raised and she appeared to have dropsy, that has gone down since. Her fins are very frayed, but she's still hanging in there.
My question mainly is whether or not I should keep her in the 6 gallon filtered tank or remove her to a quarantine tank without a filter. The 6 gallon does not have any carbon atm, due to the meds. I just feel like this tank is entirely infected now, and I need to completely sanitize it.
Should I quarantine her or keep her in the same tank she's been in?
Also she didn't get sick while in this tank, but while she was in a split tank with another fish. That fish unfortunately died of dropsy.