Can a Florida landlord retaliate against a tenant who complained?

No. Florida (like every US state) prohibits landlord retaliation against a tenant who has done something legally protected, such as complaining about habitability to a code enforcement agency, filing a fair-housing complaint, withholding rent for a habitability defect with proper escrow, or joining a tenant union. Common retaliatory actions are illegal: rent increase shortly after complaint, eviction notice without independent cause, refusal to renew lease, removal of services, or harassment. The protected period is typically 6 to 12 months from the protected activity. If the landlord raises rent or evicts within that window, Florida courts often apply a presumption of retaliation, shifting the burden to the landlord to prove an independent reason. Damages can include treble damages, attorney's fees, and statutory penalties.

Source: Florida landlord-tenant code; anti-retaliation statutes