Is there a reason you only want to use 1 bulb? It will work, but two bulbs on a 36" tank will give you a real nice coverage. I would go with 250 watt, in the bulb of your choice to provide the color you are looking for. Personally I love the AB 10K bulbs but they are hard to find around here. T5s are Ok, but spend the money and go MH with T5's to supplement the color.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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