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One of those clamp on light shades for any screw in bulb can be hung over the tank with the CFL bulb in it. I've seen people line them/w aluminium foil and/or paint them on the outside/remove the clamp etc as far as efficiency/looks is concerned but mainly to raise it higher than just using the clamp on top of the tank. Why...cause ONE CFL bulb @ 11-13W is too much right at the very top of the tank if there are few plants.
Any more than that and you'll never be rid of algae without using an algacide weekly.
 
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