I saw a tank once in a friends home..it was a quarter circle that fit into the corner. There were stones glued onto the side of the front to make a frame and to make it look like someone had cut a whole into the side of the pond so that you could see. The effect was really neat. One thing that would have made it even better is if on the wall behind the tank, there was a waterfall spilling into the tank. If he added this to the setting, with lots of plants on the waterfall and even filtering material hidden in key places...would it be difficult to make this do the total filtering of the tank? The tank was about 130 gallons.