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We did just do a chemiclean treatment on this tank.
^^ This is the X factor, especially since the OP said a tang died following treatment.
Does the fish's skin appear to be peeling or sloughing off? Brook is common in clownfish and copper does not treat it: https://www.reef2reef.com/threads/brooklynella.247938/
There are photos of clownfish with brook in the link above, for comparison purposes.
