I would do a kalk ATO in your tank IMO. But saturate it more than the normal amount. Typically its 2 tsp per Gallon. In one of my system I'm actually @ 2 tbsp. per gallon *High demand CA*. I believe Kalk will have a PH of 12.7-12.9 for a full saturation of 2 tsp per gallon. With 2 tbsp it will be the same PH because Kalk will not surpass that, but your saturation level will be 3x more so it will take less kalk ato to hit your parameters. So if you have a tank that has more demand, I would go this route. Just make sure your Kalk has time to setlle down before topping off in your system. I set my ATO on a timer rather than a sensor *Sensors can calcify and get stuck/malfunction in time* Measure how much evap you have per day* i.e. typically evap is 2-3% of your total water volume. So say you got 70G its around 2-2.5G per day, I would set my timer to drip my dosing pump for a length of 8 hrs *during lights out is best* say midnight to 8am that is when my PH is the lowest and then when my display lights turn on the corals have CA to absorb while the PH/alk maintains normal parameter at night and day so the corals will have more of a consistent PH/ALK throughout the 24 hr. period. Also during the daytime you can also dose extra CA if need be.
I'm sure you probably know this, but just in case:
*Make sure you aren't dumping 2.5G of Kalk ATO at once, but in the 8 hours time period, slow drips.
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