brown and yellow spots on my plants

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It sounds like you have a nutrient deficiency. Look at the chart in the link and see which one most closely matches your plants symptoms, it could be more than one. The first that comes to mind for me is potassium.

Can you give us some more details about your tank, such as what size tank it is, what kind of lighting you have, and what kind of plants are in your tank? Also, do you run co2?
 
potasium and magnesium I think, I could be wrong but I do beleive that is the assumption I came up with after viewing the chart and connecting the dots.
 
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