Copper treatments

[Aquattro]

I thought I read somewhere that muriatic acid might do it. Fill the tank with water and add acid, then after soaking for a few hours, drain it somewhere you can neutralize it with baking soda (into the bathtub or something) and then refill with water and add some copper removing compounds. Let sit for a few days, or longer.
Try and double check my theory, I'm only half certain this was what i read.