dont do it. Channal cats are active predators at night and arowanas by day. a channal catfish is coldwater and an arowana tropical. I mixed tropical fish with temperate fish and it never works. arowanas are slow and would have tough compitition with a fast moving stealthy channal cat.
The hard part is keeping it in the tank.i was watching a youtube video of an arowana feeding with a snake head and the snake head was hogging the food cuz the poor arowana wasnt fast enough. anyways aint a good idea.
you have a 150 gallon tank...the aro want fit in that for life let alone the channel cat..those fishes you talk about are monsters ..please do a little research