Want to Add commas between the displayed values.

(FK_Ticket_Product__c.Customer_Experience_Code_1_Value__c)+(FK_Ticket_Product__c.Customer_Experience_Code_2_Value__c)+(FK_Ticket_Product__c.Customer_Experience_Code_4_Value__c)+
(FK_Ticket_Product__c.Customer_Experience_Code_5_Value__c)+(FK_Ticket_Product__c.Customer_Experience_Code_6_Value__c)This is a valid formula and shows the 5 fields i want concatenated in one text based row level formula. However i want commas or a space, or any separation between the parenthetical information. I cannot use the typical syntax funcitons of which i am aware, such as \ or ",". I get Syntax error extra "," or syntax error blank. What is my user error here?