When I was first thinking about getting into Asian Arowana, researching/learning, seeing many pix and videos, it soon became clear how crucial lighting is when it comes to showing them, even more so than most fish. Given the sheer size and nature of their scales, they're kinda like floating mirrors and usually reflect whatever color is thrown at them.
Here's a good example of the power of lighting -- local monster fish shop did a big re-modelling recently, incl. moving fish/tanks around. Personally I prefer more natural colored lighting for my Aros, but I have to say this lighting set-up looked pretty wicked, even in bright day, at night I bet it would be pretty mesmerizing to watch.

Very short clip:
Here's a good example of the power of lighting -- local monster fish shop did a big re-modelling recently, incl. moving fish/tanks around. Personally I prefer more natural colored lighting for my Aros, but I have to say this lighting set-up looked pretty wicked, even in bright day, at night I bet it would be pretty mesmerizing to watch.

Very short clip:
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