The scales and body color of the reared arowana show up with the increase of age, so unlike the red dragon, which uses plant lights to attract color, it changes the color of gold, and the blue at the bottom of the scales becomes purple-blue. When the area not illuminated by plant lights returns to the original color of arowana, the golden luster will be dazzling, but the scale background color will be pale. Therefore, it is suggested that you can use lighting to observe fish, and usually use indoor light source.

Extended data:

The size of arowana is generally smaller than that of red dragon, and it can grow to about 50 cm in an aquarium, and a few of them can grow to 60 cm, so it is necessary to prepare an aquarium above 120×60×60 cm.

Arowana is usually more neurotic than red dragon. When it is frightened, it often doesn't eat for days. Therefore, it is best to raise the dragon in a 75 cm water tank and train it not to be afraid of human interference, such as cleaning the water tank and changing water. Grow to about 30 cm, get used to getting along with the owner, and then move into a tank over 120 cm.

References:

Baidu encyclopedia-arowana