QT question

[Jahalu]

I have a cycled QT. I added copper medication to it. Did I just wipe out my beneficial bacteria? It's not reading any ammonia yet, but I just had this bad thought that the tank is now not cycled. I can find arguments both ways online, so I'm confused. Thanks ahead of time...

 

[melypr1985]

The copper will kill some of the bacteria but it's able to recover quickly and isn't usually enough to cause an ammonia spike in an established/cycled QT

 

[Jahalu]

Ok, thank you!