Just a bucket of Ona Pro with the lid open will suffice for your grow. If that isnt enough, Ona is expensive over time, consider a small ozone generator for the tent, but keep it on a timer that runs for 10-15 minutes every hour instead of always on fulltime. That'll nail it fast. Carbon filters are also an alternative, but those require more electricity and fans to get a negative pressure for it to work its best potential. Lower power fans and carbon arent great, as they dont force the pressure against the carbon and all those thousands of micro sized porous openings to trap the stinks. So, Ona and Ozone will be the best and most inexpensive over time formula for your sized grow op.