When Amazon has them, they also have the best price on them. The fixture that came with my 20 gallon nanotank made the tank too hot. For tropicals, that's not an issue, but for marine tanks, it messes everything up. I have a nice Coralife fixture that sits in the center of the top and this light is perfect. I can use this and another compact fluorescent or I can use one compact fluorescent and a blue light. Amazon ships wicked fast and you will not find a better price. I know I haven't. I now just have tropicals in this tank, so just one of these bulbs gives a good light without making it too bright and causing an algae overgrowth.
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