Per User Bandwidth Usage Graph

Hello,
i implemented nat for internet and pcq for bandwidth controlling now i need graph per user (realtime , week and monthly) bandwidth usage , i’m trying to use netFlow but i do’nt know which software is good for me ..
any suggestion
Best Regards,

You can get Netflow graphing working with CactiEZ pretty fast, google around, there are tutorials availible.

Thank you for your responding .
i did not found good tutorial , could u please show me what to search ?
Thanks