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Too much light?

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Hi, rather new to this.
In my 10 g tank with CO2,
and Marineland 18" LED plant light.
My hemianthus HC and Pogostemons have
Grown well,but recently there is a
Yellowing area down the center of the tank,
Looks rather burned out. Is it too much light,
or insufficient nutrients? About 65 days on tank,
Fixture sits about 1" above surface,10 hr light cycle.
Fertilize lightly seachem micro and PK.

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