Fla. Stat. § 75.17

Every person who commences an action as taxpayer or otherwise to challenge the validity of any bonds or certificates or to prevent the use of any moneys derived from the sale of the bonds or certificates after the bonds or certificates have been validated by courts of competent jurisdiction pursuant to this chapter, shall file an affidavit of good faith stating that the action is not filed for delay and setting forth with particularity why the objection was not made as part of the validation action.