its not really a fuge. In my sump I just have this one area not being used right under the bio ball chamber that gets good flow. I have LR rubble, some ls, and more lr rubble/mud in there now. I have some cheato, and I am going to home depot today since it is on my way. And I decided to pick up some sort of light for that part of my sump so I can move he cheato down there.