I am trying to decide about putting something on top of my tank. I currently I have a Orbit lighting unit on top and open water. I was thinking of puttin something over the water to help with skiddish fish and anyone that might drop something near the tank. What, if anything, do you guys recommend? I'd rather not use glass or anyhting that really restricts the water/oxygen exchange too much. Was thinking something along the lines of the eggcrate or some sort of net/screen?