Was the fish WC?
(just to comferm this)
If you are seeing a change in the behavior of the Gramma, no spots and nothing in the FW dip... You could have Brooklynella.
Do you have a Q-tank? I would remove all fish to a Q-tank and treat for Brook using formalin.
Maybe it's time this thread was moved to the disease forum. Mods?
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