That depends on the type of light and intensity of light. Typical freshwater aquarium lights designed for fish only or plastic plant tanks are mostly low intensity and heavy in the red spectrum (to enhance reds in fish) and do not support either plant or algae growth effectively. Neutral Regulator has been in wide use in freshwater tanks for at least 18 years with virtually no complaints of algae growth. That does not mean it cannot happen. Other factors being present, such as high nitrate, high organics, exposure to sunlight or other strong sources of light, the added presence of phosphate will be another contributing factor. However, even with no measurable phosphate, if the other factors are present, algae growth will take place. Algae problems do not arise from a single contributing factor. The operative word is "contributing.
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