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Kalk will raise your alk and I think maybe calcium too. I wouldn't expect it to go down if you continue dosing it. 11.5 isn't too bad, but could be an issue for acros I think. I haven't personally used kalk.I did use Kalk in combination with fresh air into the skimmer. I've never had Alk at this level so it is a little concerning but from my research it isn't an issue as long as you have slightly higher nutrients. Like I said I'm going to wait to see if things level off in the next couple of days.