Adding some co2, a new setup from Supernatural using the excellofizz pucks called the Excellowizard. Used the pucks before but was just dropping 1 in the water when I went into the room, so it was a quick blast of co2 without any regulation.
This new setup works by displacing water with an airpump, so on a timer it doesn't waste when the lights are off. The instuctions say it should fill a 10' x 10' room to approx. 1500ppm when run for 15 minutes, I'm trying out 15 minutes on every 2 hours. I'll have to grab the regulator & sniffer out of the other room to see how it does & get it dialed in.
Yes I noticed how dirty the old fan is, I'll have to clean it off tonight so I'm not blowing dust all over the girls...
Edit: Timer is set for 15 m every 2 hours not 1