CR,

I got your idea. I suggest you to use fiber glass tub, stone slab, wood, plant. Pls go to 1 Utama Jusco Home Centre (former ikea location), look for plants area. You can find black color fiber glass tub. Then you need to do a little wood work to make raise floor cover arround to tub. Put some stone slab for decoration. You also need to put some pot of plant to cover your canister filter/power point, etc. Got it ? Sorry, i am not good in drawing, can't draw out for you.

I am dreaming to hv my own pond too, but no space & balcony also small..

regard
eu