If you raise Lanshou goldfish on the balcony, it is best not to let direct sunlight. Because the sun is always shining, the water temperature will rise, especially in summer, the temperature on the balcony itself is high, coupled with the sunlight, the water temperature in the fish tank will become very high, and it is difficult for Lanshou goldfish to live normally at high temperature. Moreover, if you spend too much time in the sun, algae and moss will multiply in the fish tank, which will affect the water quality in the fish tank. Moss and algae will also compete for oxygen in the water, which will reduce the dissolved oxygen in the water. In addition, Lanshou goldfish can't bask in the sun for a long time, otherwise it will affect their body color.

If the natural light can reach 2-3 hours, there is no need to supplement light when raising Lanshou goldfish indoors. Because Lanshou goldfish don't need to bask in the sun for a long time, 2-3 hours a day is enough. If indoor feeding can't receive natural light, it needs to be supplemented separately. Breeders can install aquarium lamps to keep the body color of Lanshou goldfish. Lanshou goldfish has many colors, so breeders can choose different aquarium lamps according to their different colors. It doesn't take too long to turn on the lights every day, about 4-5 hours.