If you changed of the water and wiped down the tank would it still be unsafe for inverts?
To answer an earlier question, I'd keep going with the current treatment. It's already started, so you might as well finish it. Especially if you don't have an accurate copper test kit.
Yes and no. The silicone I am told can absorb some copper, which can be released later on. However, my 55 gallon display tank, I used as a quarantine with copper in the beginning. I ran Cuprisorb to pull the copper out, and as mentioned, that tank is now my display. Inverts and corals are doing just fine.
However, I would recommend if you have space for it, to set up a second quarantine specifically for inverts. That way you can leave it running with a bit of rock and such. Run a batch of inverts, which is as simple as adding and waiting 45 days, then move to display. Then just leave it running and keep it topped up for next time. I've found quarantining inverts in a new, sterile tank tends to have a very high mortality rate.