eggcrate is what i got on all my tanks
works great
you could look at Rona,Home Depot,i get mine at Totem (http://www.totem.ca/product.aspx)
hope that helps
Andrew

I used plastic screen for like the screen door on your house.
I placed it over my lights and cut pieces on the back to fit around my wires and pipes and used those big paper clips to help weight down the front.

You can buy window screen making kits for cheap. Then you get a trim around the screen custom made for your trim.