Under those facts, the tenant should consider availing himself of his rights under Florida Statutes, Sec. 83.56, to terminate the lease based upon the unit's not being legally habitable. It is important to follow the procedure set forth in that statute to the letter.

Before sending any legal notices, the tenant could simply ask to be released from the lease -- if that's an acceptable resolution. If the landlord agrees in writing, then the tenant can move somewhere else and put this unfortunate incident into the past.