Dustin,

What kind of copper. Chelated or ionic? Do you remember who the manufacture was?

I would fill the tank with freshwater, run it for a day or so and then test it for copper if is is more than .06-.09ppm i would crash the ph, then after 24 hours dump the water. Then refill and test again in a day or so. If that didn't work, I would consider not using the tank.

I'm not totaly sure but i believe seawater is @ .09ppm copper.

Ken Kohler