1. It is better to keep the water color in emerald green. The principle is that the longevity of black orchid can be seen. When the water color is too thick, it will have a bad impact on the longevity of black orchid. If the concentration of green algae is too high, it will affect the longevity of black orchid. Shou's gill respiration.

2. Feed Hei Lan Shou animal feed such as water fleas, earthworms, yellow powder Insects, caterpillars, worms, etc. The main food is earthworms and white sesame seeds. Both red and black earthworms can be fed.