Found this on Liveaquaria.
Similar to other boxfish, the Cowfish Longhorn's skin is poisonous and, when threatened, it will release a toxin lethal to other tank members, including other Longhorns.
How are the other fish? The trigger could be getting stressed out. I had a Niger trigger doing fine and then just go the other way when I put a porc puffer in the tank. I would move Blue cheese to another tank, if not you may lose all, if it is poison GL
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