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Hey Alan! Did the fish doctor say anything about quarantining anything else wet when you talked to him? Humblefish has some articles on ich and velvet being able to encyst on snails, etc. Seems like a waste of time to go through that level of fish quarantine if you just throw everything else in...Unfortunately I won't be an amazing help. Probably extremely little help actually. Sorry.
I agree there appears to be damage but I suspect more secondary to the issue then the primary problem. I would expect a parasite but without samples would not be able to definitively diagnosis.
Someone from the local Dallas club had a question about a obvious external parasite and I called around and finally spoke with a fish only veterinarian in New York. His personal marine fish would undergo copper treatment and praziquantel in two separate quarantine tanks. They would start in one tank then once a skin scrape, scale examination and fill scrape was negative move to the next tank. Again pass negative testing before going into his display. He still had entire tank deaths from parasites.
So much of this hobby is a psuedoscience with out true reproducible diagnostics, testing, and treatments. Most of the information is hearsay and since it worked for someone who had a bunch of tanks it must be true. The only true veterinary textbook I could find years ago was from 1980 and still said using saltwater from the ocean was a good idea for water changes.