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The lack of red coloration is a result of the red pigment of chlorophil not being near the surface do to the period of darkness. Th eleaves being curled up is a phototropic response to no light source. You know how plants in windows grow toward the sun? Aquatic plants close up at night to help conserve energy and nutrients and to allow the stomatas on the bottom of ht leaves to have better access to...something. Well anyway, it is perfectly normal and healthy. No need ot worry:)
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