From what I have read here, you should let your tank lay fallow (i.e. fishless) for 8 weeks to get rid of all the ich parasites. They need fish to host and without fish they die.
Don't know much about the Cuprisorb, but IMO
you are SOL on the reef thing or even shrimp, snails, and anemones. Even a minute amount of copper will kill them, and copper can leech into the rockwork and other surfaces, leeching out slowly over time.
But hey, you can still have a pretty awesome Fish Only Tank. There are some beautiful aggresive fish that would eliminate your ability to have inverts or corals anyway, so just make the best of it.
Just make sure you don't take any rock or sand (just to be safe, pumps, tubing, etc) from this tank and put it into a tank meant to be a reef or have inverts.