In fact, the growth of the aquatic plant lotus root needs sunlight, and the maintenance of aquatic plants needs to provide sunlight as well as very sufficient natural light. Generally, five to eight hours of sunshine are needed every day to avoid yellowing and lack of nutrition of leaves due to insufficient sunshine. But sometimes there are other creatures in the fish tank, which may block the sun or cause the fish tank to be out of the sun for a long time. At this time, it is necessary to add incandescent lamps to the fish tank when the sun is weak or there is no sun.