Actually, picked up a copper test kit yesterday and checked. Zero copper in the water. They seem to look and do fine, no additional deaths since that one sunday. Will keep my fingers crossed.
The ich, while I'm sure not gone is no longer evident on the fish. Never got worse than the initial spots, will have to see if they show up again shortly or not.
eDIT: Can't seem to find a yes or no anywhere but I do have a couple stainless steel washers under the soil and a stainless steel screw into the driftwood. Anyone know if they use copper in the standard stainless washers you would pick up at HD?