Is the knifefish you're talking about Apteronotus leptorhynchus? If so, it uses an electric organ and has weak eyesight.
Not much info is available in regards to keeping them in aquaria besides the fact that they get about 10 inches long. Most info on these guys are scientific articles regarding their anatomy.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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