Hegel's wild, colorful eyes are mostly dark brown to dark orange-red. Generally speaking, Hegels are more sensitive and timid, and have higher requirements for water quality. They need very soft and sour water, and The water temperature is also lower. In the natural environment, its PH value is often between 3.2 and 4.5. Only in the rainy season, its PH value will rise to 5. You can see that this is acid water.

The blue-faced Hegel survives The environment is more acidic, and it has the lowest pH value, generally around 4. This is also the reason why blue-faced Hegels rarely appear in aquariums. Most of the blue-faced Hegels were killed in the process of capturing and transporting. Therefore, it is best to raise Hegel alone, and it is a better choice to adjust with a lower water temperature and a lower PH value.