Thank you Steve-s for your reply!
OK, so if it is copper it didn't come from the Kick Ich as you indicated. I went to Ruby Reef's website and confirmed what you said about there not being any copper in their product.
I went home for lunch yesterday and found two of my snails appearing to be in bad shape.
One of them was one that I had already found upside down a few days earlier and uprighted. The other one hadn't moved much in a couple of days. I moved them into my qt tank thinking that this might get them away from whatever was causing the problem and allow them to recover. This morning the one that I had uprighted was clearly dead. He had a little sliver in the shape of a half moon about 3 mm at the deepest point taken out of him. The other one was cruising around appearing to be doing great. Could something be attacking them? I counted 3 large snails last night that appear to be very healthy still.
I have three types of hermit crabs in my tank along with a lobster (unknown type) and two crabs (unknown type).
I don't have a protein skimmer yet, but I am working on getting one repaired (D&D marine 'The Beast') so hopefully I will have one in operation in a couple of weeks. Could there be a large buildup of dissolved organics that are causing health problems?
Thanks again in advance for any thoughts.