The time when Luohan fish fry begin to change color is related to the species, and generally it begins to change color at 3 ~ 5 cm. For example, the common pearl arhat will begin to change color after 3 ~ 5 cm, while the golden flower arhat will generally wait until 7 ~ 12 cm. How old did the fish start to change color? How long does it take for fish to change color? Mainly related to different species and peacetime feeding methods. Usually, when the fish is raised to an average of 3 ~ 5 cm, it will gradually start to change color and need a lot of nutrition to supplement it.

The pearl arhat fish is large and prominent after deep hybridization. The probability of this kind of arhat fish is still very high. About 3 ~ 5 cm will produce the head seat, mostly water head, and the starting time is the earliest among the species of arhat fish.

Podocarpus Jinhua is a shallow hybrid Podocarpus which is closest to the original wild fish. It takes patience to raise this kind of arhat pine. Starting late, it usually takes 7 ~ 12 cm to start exerting force.