Silver arowanas at that size usually sell for $30-$40 each, no joke man. At that size, they're more of a burden than anything else. They're pretty common fish and most people don't have enough space to raise them, so the demand is low. I'm not trying to hate, I'm just telling you the truth. I know all of this because I had a 2 foot long silver arowana that was a pain to sell. I finally sold him for $40 after a few weeks of trying.