I would like to know what people like to use on the back glass of their tanks. Do you paint it and if so, what color do you like? The contest winners tend to have an ethereal light sky-looking background. How do they get that? If you leave the glass clear, then you can see the cords hanging down behind and the things on the wall behind the tank, such as a window. Also, how do they do without the equipment like filter pump and heater?