I'm starting a 10 gallon hospital tank to treat sick fish with copper. I don't want to dose in my display tank. I have a HOB
filter, heater and a little light and also a power head. I took a couple of pieces of live rock from my display tank and a cup of live sand. My question is do I need live rock ? Won't the copper kill all the bacteria? Also doesn't copper medication work really fast on fish so they won't be in the hospital tank for too long? I'm just wondering if I can do without a biological filter for such a short amount of time.