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It depends on what you what to do.

I have a low tech tank with aquarium gravel and dose excel. Plants do grow. But not all of them. I have, over time, added some of the Schultz Pond substrate to give a little extra boost when plants started to do very poorly.

Now I can't imgaine you would want to do gravel with a high light Co2 tank, but I don't know much about that
 
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