Originally Posted by firstname.lastname@example.org
Don't clean the piping. The oxides have sealed the metal.
If you do want it shiny, have a musical instrument (horn) company do the polishing and seal with a synthetic varnish.
All the faucets in your home are made out of brass. Many of us have lead soldered copper water pipes. The water coming into my home has more copper in it than I'd get from the piping. A lot of older homes in cities have lead lines from the street to the meter. Even that didn't cause a lot of "old time" fish breeders from having issues, decades ago. Metal oxides aren't just rust.
It's also possible to have the inside of the pipes plated, but that would cost a bunch.
I did not know this. How come we are always told to use something like Novaqua to remove copper and other heavy metals from tap water? I do want the tank shiny but I could have just the outside done if the copper and nickel oxidized surfaces are truly aquatic flora and fauna safe. Wouldn't water turn the copper pipes green?