I had a fat 10 incher once. In my 135 with sand substrate he would take mouthfuls of sand and move it to either end of my tank. He buried my large snails and killed them. Very aggressive. Terrorized everyone in the tank. Very cool fish though.
I have two albino Notopterus knives that resemble the albino shown, however for 30 bucks each i will continue to believe confidently that they are notopterus . No point getting my hopes up . Nice fish regardless of what species it is the albinos are very sharp looking..