The only "small" species provided in the trade, are mainly African Knives, which you had mentioned. The only other I can think of, would be Eigenmannia virescens (Glass Knifefish, or Green Knifefish). They're a schooling species like the africans, but also have the potential to reach 12" or so.
Most knives reach anywhere from 8 inches to a few feet, at least the ones offered. The smallest tank size for even the smallest, would be around a 55g or so.
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If you put "u" instead of typing out the actual, shocking, three letter word... i'm not going to read your ramblings.
I'm so behind it's not even funny.
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