1. It is actually very common to change the water to cause the refusal of the horse face horn. Because of the water change, there was a large temperature difference in the water body of the fish tank, and the water quality suddenly fluctuated. So the resulting refusal to eat by the horse face horn is actually quite normal.

2, The lack of competition for the horned hornets may lead to food refusal, which may occur at very low stocking densities. After all, it is more fragrant that there must be an object to eat.

3. In the case of polyculture, there will also be a situation where individual horse face horns refuse to eat. This kind of possibility is purely robbing, and there is no way to simply not eat it.