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Whatever your mind can conceive, you can build but you must have sufficient aeration and bio-filtering. Media Beds can provide lots of bio-filtering but whether adequate would be determined by fish load and feeding.
Should you go with a media bed, there are at least three options for water return to fish tank, (1) continuous flood, (2) timed flood and drain and (3) siphon. I can't speak to siphon but options 2 and 3 don't require a specific size of hole, only a hole adequate to drain the water volume pumped to grow bed.
I've read that you can grow lettuce with tap water and a candle so although you may be limited in what you can grow, you can use light from your window.
Generally it is recommended that tanks be shaded but your choice.
good luck
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