Yes. Nighttime. That is why I said CAM plants specifically. I don’t know! I’m probably not understanding! Anyway, I really enjoyed you tank and your journey and your methods and seeing some fish I haven’t seen actually moving before (and only in photographs). I couldn’t stop once I saw that CAD drawing of your ‘new build’ to be honest! Long may it continue!The air to the skimmer is taken from the outside but there is huge interface in the water surface that´s bring down carbon dioxid that not are consumed during night by my refugium (Light on during night) - The refugium is a little bit to small - it does something normally (the pH curve is around 0.1 higher when the refugium lights are on. In February - I run my refugium lamp between 21:00 - 9:00 - you can see the pH dip in the chart
Today - I switch of 10:00 and at that time the photosynthesis in the DT have start to "absorb" CO2 - no dip around 9_00 now - the small dip you see some days is earlier and probably caused of the fact that two persons have left their bed
Now to the plant issue. I do not think is a very good idea because I need the CO2 during day time. My corals are using more than the amount going down from the air during day time - During some time I switch air to the skimmer between day and night - maybe I should do it again. Its the air´s content during nighttime that´s problematic. The best way to handle this is probably to do a larger refugium - but there is no way I can do that
We have green plants - but also a cat that love to walk om the shelfs to the widows
Sincerely Lasse