A few Q's about a dirted tank I'm starting

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My local Petco has a $/gal sale going on so I couldn't help myself, I got a 20G high so I can grow more/taller plants. Will this effect my lighting? I usually go by this chart.


My fixture is (I assume NO) T5NO 14Wx2 6500k

From which I can determine I have medium lighting if I drop the light to the top of the tank. Just wondering if I will be able to get the growth I want with medium lighting. My goal as far as growth goes is to have a wide selection of plants I can grow out then transfer into my other tanks.
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