1. Harmfulness to fish: Scavenger will eat moss and algae in fish tank when he is young, and he will also eat some food left by fish. But as adults, they will prefer meat and have the habit of smoking fish. If other fish are injured in the tank, they will keep sucking mucus from other fish until the fish dies. After the fish die, the scavenger will eat their bodies quickly. In addition, scavengers also like to eat fish eggs. When you are very hungry, you will eat smaller fish.

2. Harm to the environment: Scavenger fish are invasive alien species, which have strong adaptability and great harm to the environment. In addition, they have no natural enemies in China. If they are accidentally released into the wild, they will seriously damage the local ecological environment.

If he doesn't want to raise it, he can choose to give it away or ask whether the local aquarium recycles it. Generally speaking, aquariums recycle fish. If you can't give them away, you can kill them.

It should be noted that scavengers cannot be released because they have no natural enemies in the wild in China. If they are released into the wild, they will compete with local fish for food and eat the eggs of other fish. Moreover, their reproduction is relatively large, and if left unchecked, local fish are likely to disappear.