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Kalk will certainly help you supplement calcium and alkalinity for sure and is valid part of a reef keepers arsenal of tools. Kalk does have a naturally high PH so one way is to dose this in reverse cycle to your lights, similar to how you would run a refugium light sequence. As your ph naturally fluctuates during the day, add the kalk when the ph is lower (at night) to avoid any ph shock. If you decide to run Kalk via your ATO you can do what Mike Paletta does and only use your ATO at night. Personally I would not recommend that but rather use a kalk stirrer and dose in the evening. (Although who am I vs the great Mr Paletta). By dosing you can control better and keep in balance adding the right amount of calcium and Alk thus limiting the risk of overdosing (which can happen in kalk+ATO applications). A really great alternative to Kalkwasser is Carbocalcium by Tropic Marin. It won't impact your PH (nor salinity) and is highly concentrated so a little goes a long way (i.e. Kalk you need approx 5.5ltr of saturated solution to add 1g of calcium, carbocalcium can add this with just 25ml of solution). Note Magnesium and trace elements would still need to be supplemented separately. (If you have a small tank Tropic Marin's 'All for Reef' is another great alternative) As your are dosing manually I would recommend purchasing a doser as you can spread out the dosing across the whole day to avoid shocks. https://www.reef2reef.com/ams/ph-and-the-reef-aquarium.7/ this article is great for understanding all things PH in your reef tank and will help you if you feel your PH is too high (or too low). Regarding co2 limiting ph. I would simply run your skimmer air hose from an external source and see if your ph goes up. Although I see your worry is more about PH increase so maybe a little co2 is helping you. My bad for reading your post late at night haha. Good luck. Hope this helps. Sent from Singapore Reef Club mobile app