I currently have a Yellow head jaw fish and a yellow tang in my 110 gallon aquarium. My Tang constantly pays a visit to the jaw fish burrow to keep him in check. The tang seems a little aggressive to wards him and the jaw fish responds by swelling up and hiding in his burrow.
I have read you can keep several of this species together but in a 55 gallon I would limit the amount to 3 - 4 IMO. If they decide to battle for room one or more might decide to commit suicide by taking the big leap.
I was lucky to be in the room when my Jaw fish went carpet surfing behind the tank. He leaped up and through the egg crate I had place over the tank. After he made his permanent burrow I removed the egg crate and glass from the tank and he hasn't tried to escape since.
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Stan
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