What did you use to treat?
Many here believe in meds as kind of a last resort. I use them the first sign of something bad. Anything that even looks remotely bacterial and I salt and treat. Lost too many rays to bacteria. Prior to treatment it's a good idea to give your filtration a good inspection. Any gunked up bio? Plugged mechanical filtration allowing contamination of bio? Any canisters that are over do for a cleaning? Seemed like every time I had bacterial issues I found poorly maintained filtration. After knowing what to look for I was sometimes able to remedy the problem with a massive filter cleaning and salt alone if caught early enough, but if not meds were needed. Unfortunately it seems really hard to track down Binox these days, and haven't had a chance to find anything that seems to work as well. Have a KG of Bifuran here, but since keeping filters clean it's been a while since any bacteria has popped up here.