Nope, there's no way to get them to stop fighting really. Aside from that, a 55g isn't an appropriate home for a black ghost knife. They require a much bigger tank, as they get to be about 20" long and need swimming room and room to turn around in. 80-90g should be about the minimum.
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Tina
Puffers:
Auriglobus silus x2
Colomesus asellus x1
Tetraodon travancoricus x1
Tetraodon biocellatus x2
Tetraodon nigroviridis x1
Tetraodon baileyi x2
Tetraodon lineatus x1
Tetraodon palembangensis x1
The greatness of a nation and its moral progress can be judged by the way in which its animals are treated. - Mohandas Gandhi
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