CO2 Help!! Do I need this for "THIS perticular Setup??

I have an Ebb and Flow system:

4 600w hps
4 20 gallon trays
2 340 cfm inline fans (sucking out)
1 dual fan at 450 cfm (sucking in)
2 20 gallon resiviors each with its own 210 g.p.h pump and 3 air stones

After asking shop clerks, former growers, reading artilces... I would love to have some actual answers on the pros and cons of this system. What does it do? Do I really need this system? I am getting clones this weekend so please someone come to my rescue! I need answers, not some clerk trying to make sale. Thanks.

Nice setup bruv!!
personally i dont use this setup but if i had that particular 1 i would 4 sure!
i would jus read up on ebb and flow (theres alot on this site and youtube)
and jus grow!!
looks like u got goood space and nice setup..
dont waste it now lol
good luck keep us posted on how it goes +rep

Thank you, I will indeed keep posting durring my grow cycle. Thanks again.