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It's not a fragile fish. I think in many bare tanks, its just a matter of bad water conditions and stress. In a healthy planted tank, ammonia, nitrites and nitrates should never build high enough to cause that much trouble. Plants offer a more natural environment and some hiding places, so they are much calmer in general.
I've noticed though, my arowana and a few others in planted tanks, are more sensitive to high CO2 levels. They'll be skimming the surface much sooner then the smaller fishes in the tank. 30ppm is ok.
I've been told they don't like too much K too, but have not observed any reaction from mine when I was dosing 30ppm K per week.
They are good jumpers, but they only jump to catch food (i.e. passing house lizards, insect) or to escape the tank (usually when the water conditions are bothering them). My tank is half covered with 2inch grid stainless steel mesh (for ventilation and cooling fans) and half with glass.
They aren't stupid either. They will only jump if they see a hole they can fit thru. If they jump regardless of a large enough opening or in the dark (i.e. too dark to find an opening), they are trying to escape, and that means you should be checking the water conditions or tank mates (if you put large ones that might deal them some serious damage). If the fish tries to jump in the dark, turn on some lights to let them see... they are less likely to jump when they can see the covers.
Mine sometimes gets a little rough when trying to catch it's tank mates or passing lizards/insects, so has gotten a few minor scratches from scraping against the tank braces. It's important to make sure your tank braces are well bevelled or if not, split some hoses or tubing and wrap the edges.
From 4 to 6 inches, the asian arowana can grow to about a foot long in about 4 to 6 months. After that the growth slows somewhat but can grow another 6 inches within a year, give or take a few months. So... that 2 ft tank is not going to last long.
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I got anxious, have brought the Silver baby home liao. Abt 2/5 of the tank size.
e1="armageddon"]hi. me just joined. just to ask my tank dimension is 5 ft X 1.5 ft(w) x 2 ft(h) and intended to keep my aro with my discus and altums. is the dimension alright for my aro?? currently it is only about no more than 5 inch in length. no idea wat breed is it. but is asian aro. quite small. diet at the moment is blood worm. evrytime i just trow bloodworm in he will circulate ard those altums and discus and when got chance he will grab a big bite into the chunk of blood worm. hehe 
) carry parasite on their bodies which is harmful to the discus.. don't know about arowana, though
so far so good,
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