Exactly as said, it'll take a bit before the needle valve gets adjusted to where you want it. The reg breaking in, pressure relief, etc. I've found it actually takes several days for me to get everything adjusted properly, but once you do it should be good to go.
I would recommend turning your CO2
off at night as well, not just the lights. With no light, the plants are not generating O2
, and you could possibly not maintain enough O2
for your inhabitants when this happens. Also, since plants aren't using the CO2
, it's just going to waste. Turning it off at night can double the amount of time you get out of your tank.