Outdoors? Depends on where you place it and how much light it gets. If it's in deep shade, or placed against and below the HDB corridor parapet, light might not be very bright. If it's high and on inner side of the corridor facing out towards the open, then light is probably a lot higher.
In bright light situation, provide lots of CO2 (30ppm) and nutrients. Depending on the size of your tank, a DIY CO2 might not make the grade.
In a lower light situation, CO2 still helps and the dosing routine is different. Look up Ronwill's postings... he's got quite a few low-tech planted tanks in his corridors.
PS. Since you like arowanas and planted tanks, have you considered a planted arowana tank?
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