Rent increase question

[Misha Gnat]

Good afternoon BP!

I recently purchased a duplex and will be occupying one of the units and wanted to rent out the other. It already had tenants that lived there when I bought it and they are paying $725 a month. Comparable living spaces in this area rent for a little over $1000 and that's what I would like to charge also. Should I show these comps. to current tenants and increase their rent to $1000 or would it be easier to just find new tenants and ask current ones to move out? It feels difficult justifying $1000 without doing any updates to the place. I'm very new to being a landlord so I might be looking at this from wrong perspective? 

Appreciate any and every comment!