You asked about what PAR is the most you can use without having to use CO2 to avoid algae problems. If you stick with "low" light you don't have to use CO2, but Excel (or CO2 for that matter) will always be beneficial to the plants. Low light, based on that, is around 20 to 35 PAR. I now have about 40 PAR on my tank, no CO2, but I dose Excel at twice the recommended dosage, and my plants are doing much better than when I used just the recommended dosage.
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