Is this a decent carbon filter?

Not with that booster fan.

why not im rockin a 5x5 tent with 9 plants

No, these filters peter out in 1 grow. They only have 7.5 lb of carbon and the carbon chamber depth is 2". The Can 33 (which HTG also sells) has a 3" depth and twice the carbon. You will pay 25$ more though but will last over twice as long.

EDIT: As for a fan , you need a 400cfm not that little pussy spin piece of S***T. !!

thanks pat im checkin now, and yeah sound on the fans was a factor i like no noise

im not seeing it for 25 more though 75 more im seeing one

If you are going to move a good volume of air- it will not be quiet, even with a muffler it will sound like a turbo kerosene heater!

i need a muffler i sleep next to the plants,

Heres all what i got 6 inch cf tall boy with high velocity 400cfm fan for 140$ then the 6 inch duct muffler for 50$ which makes it so much quiter at night i sleep with the exhausted muffler by my bedroom and its quit