I use kalk in my ato in my 125g set up (160g total water) works good I still need to dose calcium and mag manually I evap about 5 gallons every 2.5 ish days depends on summer or winter , and I keep the mix saturated In my 10 gallon ato tank works good I say give it a try 
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Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC, QT everything
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