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[mark]

Would be thinking chlorine as well if not treating or at least aging tap water.

Really wonder how much copper would be pickup up from the piping considering everytime you turn on a tap you're flushing some on the line. Plus in my old house when I cut into an old pipe always amazed at the amount of buildup inside the lines.


Was the tank ever treated say for ich?

[Mr. Scratch]

Yes I knew a guy a few years ago who purchased tank from someone who had repeatedly used copper in their tank (even the siicone tested positive for copper). Buying a test kit will defn work, maybe isolate some of the live rock and test it was well (if the water you use before it goes in the tank test negative for copper, and the water in the tank tests positive).
If the live rock has some kind of copper contimaination...well then..that would be up to your friend.

[Pescador]

I thought copper pipe got coated inside eventually especially being an old house.
I'd be wondering about chloramine and chlorine for sure. Chlorine can dissipate through aeration but chloramine can't.