Triplex tenants not getting along

[Lacee Beitler]

Hi everyone! We have a triplex with neighbors in the basement unit and first floor unit constantly filing noise complaints on each other. It's getting to the point where one tenant "feels threatened" by the other... calling curse words through walls, etc. Both tenants checked out in background/credit checks, both have jobs and are easy to work with one on one. I'll add we had other tenants in both apartments and never had noise complaints from them. Ever. What do we do to end the apartment noise drama? They've called the cops on each other when it's loud at night, etc. Looking for any help, thoughts? Experiences? Thanks!