Hey Charlie, I cannot share a graph, I don't have a fancy monitor/computer, lol... But, I will share my observations and experience, FWIW...
At this time, the entire system is not quite needing to match at evaporation, I will likely always stay a hair under, and allow my ATO to work, but very little. I do this due to being in FL, where fans are blowing all day, on both tanks. That said, I want to have a system that will work when the fans do not need to blow all day, but still be able to dose the current schedule. Allowing my system to go where evaporation takes me, regardless of alk, the ACI recommendation, is not something I am interested in, but to each their own. I will still always dose to alk consumption, ph goes where it takes me, not the other way around.
That said, I do feel that eventually, the system will easily meet demand, I have alot of corals, and they are growing fast, and some are getting to be colony size. I gave the opposite schedule a fair shake, but the problem is that the low boy will not keep up the ph on photosynthesis, whereas the display dictates the ph through photosynthesis. Makes sense, more lighting power, more corals, and much larger, plus 2 times the volume of the prop tank. So, the opposite schedule, while on paper, looks ideal, is really not, at least from what I am observing. Kalk total over 24 hours does not change, however, after more thought, I decided to change both tanks photo periods, and my kalkwasser dosing schedule. I think that based on what I am seeing, and how my tank impacts ph, that a staggered approach is much better. Why?
average ph during high light period in display=8.3
average ph during high light period in prop=8.1
So, my displays corals are taking advantage of higher ph, while the prop tank is lower.
Display Photoperiod- 7am-8pm
Prop Photoperiod-8pm-9am
So the display hands a ph of 8.3 off to the prop tank, then slowly as the morning comes, it continues to fade. Ph holds 8.3 until 9pm, so while the light is lowest in prop tank, PH is high, and as it becomes more full spectrum, it cannot pick up the ph pace and drops, I suspect, in time, with more corals added, and more growth, this would change.
New Display Photoperiod- 10am-11pm
New Prop Photoperiod- 4am-5pm
Now, this is only 6 hours where both systems are non lit. So, I will dose 375ml/15 min interval, every 45 minutes. I use 17 intervals per day, so 12 of the 17 are built slightly before and after that 6 hour down time. I imagine the prop tank will see 8.1 to start, but as the photoperiod builds on the prop tank, so does the ph, and during its peak, the main tank begins its photoperiod, so both benefit. I imagine the display still benefits the most, since the prop tank is handing the ph off to it higher than normal, at least this is my thinking. The goal is to really just shrink the gap, and keep ph at least 8.2 at low point. I truly believe it to be of great importance. Equally to that, a heightened awareness around maintaining p04. But that's a whole other conversation, lol.
Sorry to be so longwinded
