Is that a 75 gal? Your tank is beautiful, but 360 ml is 6 DKH/day ALK- highest I’ve ever heard of is 5/day though I am sure there are much higher in the world. Maybe Lazy’s 125?
I definitely not a chemist, but I think it’s too much ALK and calcium together. Both together at these levels are precipitating each other with your relatively high PH an consequential lowered supersaturation?
Don’t want to subscribe to something that would screw up your tank, but what would your tank fall in a day if you didn’t dose for a day? This should be your maintenance amount employing the BRS reef calculator (google). Put in your desired level and current level and dose both parts at the same amount.
If it’s too scary to break for a day, since calcium now 400, consider going to 2 ALK points per day (100ml in 75 each calcium and ALK) or something more conservative.
I’ve done a lot of everything with successes and failures so I’d certainly welcome so other input here but that 360ml ALK seems too high too.