Yup...need some growth and a couple more tall plants in the back.
I've never been a fan of backgrounds and i usually don't need them because plants fill in the back.
I think that looks good even before, but whilst I don't like the plant and rock backgrounds, I find that a plain blue or black one really brings out the best in a tank. Even if it is just to hide the pipes and wires. Try one and see. If you don't like it, then take it off!!
ok..so i went an added a black background.
Only thing is now you notice when there is particles floeating around.
Any idea on how to get rid of them? Maybe place my output a different way?