@CardBoardBoxProcessor,
Snakeheads are local fish. They can grow very big and highly predatory, I'd say more savage than arowana. They've been reports over the years that occacionaly thigh-sized snakeheads bite someone who is bathing on marshy waters (imagine it sees "winky" as a treat :eek)
You can actually pamper arowana so they prefer to be hand-fed on special menus like insects, worms or meat instead of chasing after small fish in the tank. In this case I think the owner of the tank does exactly that, otherwise bill for restocking neon will not be pretty.
@Symbiot,
Sounds like a fun plan, and will be looking beautiful too with all tropical plants and misting system. I would like to make something larger scale like that, perhaps sometime if I become filthy rich. Again a bit OOT but still in connection. What do you think about this plan of a garden with a planted stream/pond?

Could be my next project within the same house, but I must keep in mind of maintenance issue before making this one reality.
@Y0uH0,
I took the shots some time ago. It is always fun to go to those two spots, especially when you do it in a year or so time lapse. I'm happy to see that they will always have something new for me every time I visit.
They avoided aquatic plants for troublesome reason? Then convince them that you have the knowledge and capability. Show them that you are a good aquascaper, that should be a big plus to your points and you get yourself the job (and you can start to add more aquatic plants after you work there).
They actually have this simple low maintenance display at Jurong bird park, set naturally relying on sulight. Forgive me again for posting non-my tank pics.

see the guy on the right? Next time if could be you doing so!
The display mimics african waters. Plants also from africa: bolbitis, tiger lotus, anubias. Plenty of fish (small sized) like congos and such.
They use this shading net to regulate just enough sunlight into the display. Should have add a clear roof like my plan, you can see it just rained quite heavily for the past few days prior to my visit, and the water became murky.
Get the job, man. The place is so serene and far from pollution, least stressfull I say, especially if the pay is good.