Serving a Notice to move out

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Hi everyone, 

I had a question in regards to serving a notice to move out. 

-i live in Denver CO and have inherited tenants on a month to month. I would like them to vacate because they are breaking some ordinances (too many people in the house, too many dogs)

-I'm not interested in trying to get them to abide by the ordinances vs just getting fresh tenants in. 

anyways with all of this COVID stuff going on does anyone know if I can serve them a notice to vacate the property within colorado statue limits or is there a complete moratorium in place?

They have paid rent so it wouldn't be an eviction based off something like that. 

Thoughts?