Luciobarbus brachycephalus, aka Aral barbel or Caspian barbel

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If you don't mind a 2ft-2.5ft barbel in a 450g, then yes. It'd be adequate I think. They do like to swim around a lot, so bigger would be better.
 
Golden dorado nipping causes us to move out the 4 younger barbels, which are about 1.5-2ft now, from the 1800 gal:


 
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