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Message: [QUOTE="Lisak1, post: 530202, member: 6145"] It’s a case of correlation does not equal causation. Do you see more string algae in the sun? Yes. All plant life loves sun. But is the sun causing it? No. The cause is always excess nutrients. Always. String algae grows like crazy on my waterfall in the spring. Why? A lot of sediment and organic material tends to gather and settle in the cracks and crevices between the rocks. The string loves it, but that doesn’t mean my waterfall causes the string algae. [/QUOTE]