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My original hood for the 10g had two incandescent bulbs, and when I went to buy florescent replacements, I found out that buying a new florescent hood would only cost a few bucks more and be cheaper in the long run.
I have a 20" (18" bulb) and it's pretty bright. My plants are for the most part doing ok. I don't think the dual bulb fixtures come any smaller than 24", but they still use 18" bulbs, so if you don't mind the fixture overhanging the sides of the tanks a bit (I believe you have a 10g?), you may find a cheap one (though I don't think the word 'cheap' applies to multi-tube and CF fixtures at all).
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