My tank is overstocked so I keep it bare, which I like because it allows the lights to light up the bottom shelf of the stand too. I put a black background on it and that seemed to really improve the overall look.Still I sometimes feel its too plain? I like to give the Goldfish as much space as possible but it still seems like somethings missing? Im thinking of changing light fixtures,air stones,filters all the time. So i would have to say im always thinking of adjustments i can make asthetically and more importantly for the health of the fish!