Hey... So my two plants are still veggin ( ak47) and are about foot and a half, 2 feet tall and when i walk into my appartment i can smell teh plants.. this is a homemade filter.. I used GroTek carbon so i no that isnt the issuse.. can carbon go bad??? oh my filter is about 2 feet long by 6in round( outside di.) and 24in by 4in inside di.. humidity isnt an issue either. should i make a way bigger filter????