Tenant stopped paying rent

[Mike X.]

I'm in south Florida, I've rented condo to a tenant with lease ending 9/30/16

Tenant didn't pay rent in Aug. I have 1 month as security deposit + last month rent.

Should  proceed with eviction steps starting with 3 days notice ? Tenants didn't communicate any intention.

If I use tenant's security deposit to cover Aug rent what would be legal way of doing it?

What would I do tenant wont vacate the property by 9/30/16 when lease ends?