My little guy ^ brown ghost, he's about 4-5 inch and isn't aggressive in the least. He sifts through the sand w/ his nose like I would expect an elephant nose mormyrid to do. They also have the longer jaw that I vastly prefer in knife fish over knives like Clowns and African Browns. More like an Aba but pointed downward. The info I found has them maxing out at 12 inch
My dream knife is an Afer, aka "arowana knife fish". Have yet to find one though.
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