I absolutely agree that dissolving ca, baking soda, mg first is better. I have the luxury of having a overflow that is fed by a 5200 gph hammerhead pump that cascades down a 30 foot 2.5 inch flexible PVC pipe to my basement heater room, to a 125 gal sump. Even with this, mixing with ro would be better and a peristaltic pump might be nice to keep kh, ca, and mg as stable as possible. I really just try to make simple the better method, good light sufficient water changes. ( I have a peristalic pump on the shelf)
I do generally test for kh every other day, it is down to about 7 each morning and after addition it is 8-9. Possibly a big jump but the coral with get accustomed to it.
gas man I am getting tired.
Yes Temple