[development] Using specific input format for textarea

Anyone know how to use a specific input format for a textarea in form api? There's no property for this option. // This is my form element: $form['easyco_custom']['easyco_custom_query'] = array( '#type' => 'textarea', '#title' => t(My Query'), '#size' => 1000, '#maxlength' => 1000, '#prefix' => '', '#suffix' => '', ); I've created a new input_format using admin/settings/filters and I need to use it here. It's a SQL syntax highlighter(it's not about executing this sql, so no injection) Thanks in advanced