While I never had to deal with removing copper I would first get a test kit to give you an idea how much copper you‘re dealing with. Then do some research on how best to get it out. Possibly search the forums or create a dedicated thread on the subject. Don’t jump the gun or buy into what people tell you. The Test kit will tell you when things are safe for your tank.
There are copper absorbing methods. One is using metal attracting floss, another is using products like Cuprisorb.
seachem.com
Take your time, don’t panic and SLOW DOWN.