Originally Posted by Bholl
Yea I installed 2 brass barb fittings, one on the pump and one on the tank for my supply or return line. So bleach wouldn't work?
I don't think so. To my knowledge, bleach will not neutralize or detoxify copper. I think there are some chlorine removers that claim to detoxify heavy metals that you might could dump in with your rock to help pull out the copper. I'd follow up with a copper absorbing media in the main tank. I'd also suggest investing in a better copper test kit, just to be 100%. It could be all you were seeing from the poly filter was a trace from those fittings.
Also, from you original post, I'm not clear if you actually had any fatalities and whether or not you cycled the tank.