High bandwidth Usage

[cheifTenToes]

I would like to have Pfsense tell me who is: (Client/Host)  using up all the band width on my internet connection.  I am very new to the whole firewall pfsense operation.
What do I need to do to see which client using up all my bandwidth.  I have pfsense 2.02. squid2, squidguard and squidlight.  I see all the grapfs it shows but I cant find out who is hogging up bandwidth.  Any help I can get is very much appreciated!!

Thank you,

Cheiftentoes

[obbe]

Diagnostics -> Traffic Graph?