egg crate is actually the light diffuser you'd see if you looked up at the fluorescent light in many elevators. They're sold in sheets of 48" x 24". I get mine at Home Depot (aisle 32) for around 11 bucks. Comes is white silver chrome and gold chrome. I always go with the white. Use a pair of longnose pliers to break off sections to cut it down to your tank's size.
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