Cool dude, glad to see you added more light..they do need it. I would get the small digital temp gauge with the humidity gauge on it as well..think you can find those at wally world for like $20 pr $30 bucks, very important to know the correct info. Place it at canopy level maybe clipped on one of the pots.

For airflow you can always put the fan pointing out of your box to exhaust the air and it will bring in cool air from your air intake holes provided they are big enough...maybe put an activated charcoal a/c filter from home depot over the front of the fan blowing out of it to help cut down on the smell if you can't obtain a small 4" can fan set-up...that's really what you need ideally and they are not that expensive. I think they have them on hydro wholesale here Hydro Wholesale offers Wholesale Hydroponics, HPS and MH Grow Lights, HydroWholesale hydroponic Supp: 4? Can Filter/TD Series Fan COMBO