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23watt bulb for 10 gal

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I have a 10 gallon tank. I bought 2 x 23 watt 6500k bulbs for my 2 clip on desk lamp fixtures. I have sand as a substrate and plan to add osmocot root tabs and DIY CO2 as suppliments. I was aiming for medium or medium-high lighting.

Are these two bulbs overkill for the kind of tank and equipment I have? Will I be throwing the balance out of whack and doing more harm than good?
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