1. Feeding: Blue triangle fish is a kind of carnivorous fish. When feeding, you can choose fish and insects, water earthworms, fiber insects, Tenebrio molitor, small live fish, pellet feed and other foods.

2. Water quality: Blue triangle fish likes to live in weakly acidic water. The pH of the water body needs to be controlled at about 6.6. It is more appropriate to keep blue triangles in soft or old water.

3. Water temperature: Blue triangle fish is relatively tolerant to changes in water temperature. It is best to maintain the water temperature between 24-28 °C, and it is acceptable for blue triangle fish to occasionally lower it by two degrees. However, it should be noted that the blue triangle fish is more sensitive to changes in temperature, so the temperature difference cannot be greater than two degrees in a short time.