If you have the money go with a double T-5 fixture, your plants will thank you for it. you can usually find a basic one, no fancy cover or plastic shield, for like $60 or less if you look for it, i picked one up a few months ago for $25. alternatively you can use a $10 shop light, it will keep the plants healthy, but wont have the same penetration. the tank wont look as lush, but it will still look good. i have a 36"x16"x16" tank that i have a 150W high output cfl suspended over and it works well enough, you may consider two of these as an option, they are like $10 each and you can make a hood for them for less than $30.
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