Hi all I've just got my first co2 system up and running. I have a 350ltr corner tank, spray bar pump outlet and an in tank co2 diffuser mounted under the spray bar at the bottom of the tank with the thinking the water flow will disperse the co2 around the tank. I'm running 3drops a second and I've been running it two days now and the co2 drop indicators are still blue. How long on first setup would co2 take to circulate and build up enough to change the fluid colour? Hours/days/weeks?