How're you doing your cipro treatment?
You should do a 100% Water Change every morning.
Apply mostly white lighting, but don't blast it.
At night right when lights go out, dose the cipro. I've found if you can grind it into a fine powder and mix it with RODI first, I just pour it into the return pump chamber it works good to actually get into the water column.
Light will render the cipro in-effective rather rapidly. Therefore basically cancelling out the treatment. Thus doing it at lights out.
Then in the morning do another 100% Water Change.
I had a 5G Nano tank that helped with this.
You could pick up a 5G tank with just a power head and probably be okay. But that way you can do WC's 100% everyday.
This is all summarized info from
@OrionN and
@Eagle_Steve .
If that's how you're doing the treatment then sometimes it can't be saved. But photos always help.