Since adding the apex, I've been really monitoring my pH. I have mostly not cared much about pH before. But knowing corals grow better at pH of 8.4 definitely makes me want to modify. I've added some chaeto to the sump and added a co2 scrubber that is recirculating to my skimmer. I run calcium around 450 and alkalinity at 8.5. I usually test daily. Since adding chaeto and co2 scrubber, I haven't noticed pH increase much at all. I am not dipping down as much at night. With lights on, I'm lucky to hit 8.15. I'm right around 7.99 at night. Any thoughts on other things to try?