Most public aquariums that do this type of back drop (especially for jellies) use a translucent blue and a piece of translucent white for a more even spread of the light. It may be tough to get the look you are going for if you don't have room behind the tank.
Home Depot type stores now have a variety of LED fixtures available.
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-Joe
Why do we ONLY RE-TEST our water when the results are NOT what we want them to be?!
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