You can, but Acid Regulator is not our recommended buffer for planted tanks. It won't harm your plants, but Acid Regulator is a phosphate based buffer, so you may experience some unwanted algae growth depending on usage. For lowering pH in the planted aquarium, we recommend Acid Buffer. Acid Buffer is a phosphate/carbonate free buffer for lowering and stabilizing pH in the acid range of pH 4–6.8.
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