My calcium level is high also (600mg/l) however I use Kent as well as Oceanic Salt usually depending on sale price. You shouldn't be concerned with that level of calcium especially if your tank is doing fine. Check your other water parameters like phosphate, alkalinity, magnesium, hardness and ph. Are you supplementing with Kalkwasser or another calcium product?If you want to lower the calcium level, just stop adding calcium for a little while so the level will go down. Or you may want to try a different brand of sea salt. _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Ceriantharia Orn.Shrimp and Stars Hermits Queen Conch asst. snails> Stars Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria(large+small polyp) Acropora Xenia Tridacna (CroceaMaximaSquamosa) Leathers <35+75gal.reef tank as well> 
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