depends on the fish.
my oscar would rearrange the tank, moving plastic plants around daily, live plants would never last, not even when it was small, so I gave up and switched to plastic.
my severums never tried moving plants and liked to sit in them.
I'd start with a substrate you like, add some big wood and some stones and go from there.
here's how my tank looks now, depending on how the driftwood floats.
and some of the inhabitants, members of the centrarchidae family.
Thanks, got it used for $50.00. Restained it, scraped the blue paint off and painted it black and ordering a new bulb to make the fish pop...50 lbs of rock from my local landscape yard - $7.00..