How to Deal with Nonpaying Non-responsive Tenant

[Tim Porsche]

Hey all, looking for some advice on how to proceed with a situation with a tenant. I purchased a duplex a few months ago that is fully rented out, with the intent to move into the bottom unit on March 1st. I notified the tenant 90 days before to give them plenty of time to prepare. They were current on their rent up until January's rent was due. They send me a check for half of the rent on January 1st for me to deposit right away, and asked me to wait until the 18th to deposit the second check as they had insufficient money in their account. I cashed the check on the 19th and just saw on the 22nd that it bounced and I got hit with a $15 fee by the bank. I texted the tenant and told  them what happened but have not heard anything from them yet. My question is, what do I do if after reaching out a few more times, this tenant remains unresponsive? I was planning to give an official 30 day notice to vacate on February 1st, but if they simply don't pay rent and don't respond what do I do? Should I start filing for eviction on March 1st in that case, or sooner? Any advice greatly appreciated. The goal is to get this tenant out by March 1st with as little lose of rent and money as possible.