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Could use more info. Distance of light fixture from the top of the substrate.
Number of hrs on per day.
Excel is not a fertilizer. Animals breath Oxygen and plants breath Carbon. Excel
is adding more carbon to the water for them. But what material is the substrate ?
 

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That doesn't look like burning. The yellow looks like nutrient deficiency and the brown is dead matter. I need more information about your tank to diagnose the problem, but from what it looks like you definitely need to add a water column fertilizer.
 
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