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Keep in mind those guys are keeping large mixed tanks packed with soft, lps and some sps. Larger tanks dont see huge parameter swings like nano tanks. The alk increase from kalk will also effect pH.Like Julian Sprung still uses Kalkwasser. I forget off hand, but there was another reefer from Julian's generation that still uses it today. So that seems like a good place to start and then make my own observations
Personally, I'm not a fan of ULNS, zeovite, triton, aquaforest or any other ulns system. Those were designed for optimal coral coloration. I also don't run GAC, GFO or reactors. However, we are past the point of how to keep things alive. Really, modern reefing is how to get best(not always fastest) growth with best coloration. Reef2reef is a great place to get advice from the pros but the deviation between nano tanks and large tanks is big. As slippin suggested, 2 part dosing is best for smaller tanks.
This is a good train of thought. Since SPS is the goal here, maybe looking through the SPS threads will help more. In my experience, keeping alk at the lower end allows zooxs to grow with the skeleton. Otherwise you'll see lack of color, white tips, and possible STN or slow tissue necrosis.I've been feeding my corals fairly heavy, trying to bring up nitrates from 0 for zooxanthellae to keep pace with the high dKH, but the skimmer only runs at night and is still keeping my water crystal clear.