Why does your water level not reach the top? Do you have jumpers? If so, that's a pretty good solution. Anyway, I'd change the background and add plants. I love all your driftwood; can't really see you fish though.
Maybe a better background would help like maybe one a little brighter also some nice green maybe with a little red in them plants would be great you could fill up your back (try to make them live plants).
I say a big peace of driftwood in the middle and make some rock caves with river rocks also add a little sand maybe since these are bottom dwellers it would look nicer...Hmmmmmmmmmm!