i need to buy a carbon filter ive been putting it off but its really starting to smell so what one and size should i buy im running a 400 watt hps 3x3x6 tent with a 6" 400 cfm inline dimmed to 50% my question is should i get one rated for 400 cfm even if im not running it at full power just a lil confused really need to get rid of almost all odor money isnt an issue just need to know what to do