A couple of thoughts for you. Definately ditch the Bio Balls. When you remove the Bio Balls you can disregard the fill lines on the side of the tank. Most people fill their Bio Cubes untill the water level in chamber 3 is at the 90 degree elbow where the return line goes into the back of the tank. If you do this then the tank will be almost completely quiet.
Also if you want to run Cheato in the back of the BC (most peope who do so put it in chamber 2) then you will need to scrape the black paint off the back of the tank so that you can mount a light on the back to provide the lighting needed by the Cheato. When I say scrape the paint off you only need to take off enough paint behind chamber 2 for the light. You don't want to scrape all of the paint off the back.
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