Need help with loach

[Bangwalldie]

I have a loach that will kill any fish I add in. So far it kill two hatchet and it current tankmates are 2 kuhli loach and a hatchet (which was added before the loach) Any idea why it behaves like this ???

[avant]

Need more details on the type of loach you are referring to.
How did you know it killed the fish?