I recently got a baby silver arowana last month around 5". Only fed him 2 ZD when he was new because he was so skittish that he won't even swim around without the smaller fish. He is fed daily with Hikari Food Sticks, but 1 of its eye is already showing drop eye. He is around 6-8" now or even longer. I guess its captive bred since even though its a baby it is already showing DE.