Based on lack of any advice, seems nothing can be done for this fish, and it is a matter of time until it dies.
I feel cursed by this hobby, having been in it only for a year! What can go wrong, seems to go wrong. Many experts here at RC are strong proponents of TTM, and the vast majority have great success with it. Except for the posters in this thread, use of newly mixed saltwater doesn't seem to be raised as a potential problem using TTM. I don't recall reading any recommendations that Amquel be added to freshly mixed water to treat any potentially present ammonia, only on day 2 or day 3 to neutralize ammonia generated by the fish.
I feel cursed by this hobby, having been in it only for a year! What can go wrong, seems to go wrong. Many experts here at RC are strong proponents of TTM, and the vast majority have great success with it. Except for the posters in this thread, use of newly mixed saltwater doesn't seem to be raised as a potential problem using TTM. I don't recall reading any recommendations that Amquel be added to freshly mixed water to treat any potentially present ammonia, only on day 2 or day 3 to neutralize ammonia generated by the fish.