I know this is late, but this slipped by me. I treated with copper several times in my 125g tank and I now keep all manner of inverts: xenias, kenyas, zoas, anemones, snails, hermits, GSP, horeshoe crabs, etc, etc. I kept the same DSB and filtering systems and LR. I used Amquel+, which states on the bottle it removes copper and I always use carbon in my filters. A half year after the last copper dose, I added hermits and snails without any losses. Since then, I've added TONS of inverts and they are in, on and around every inch of my tank and growing and spreading like weeds-including the snails. An aquarium myth if ever there was one. Plain, black carbon+Amquel+ will clean your tank-it did mine!