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I have a sps dominated 180 gal tank with a calcium reactor and my calcium shot up to 600 my magnesium 1500 and alk 9 dkh. How can I lower the calcium without shocking my corals is the questions. Thanks in advance for any help
as already stated calcium that high will not harm anything, to lower it will tak some time by changing water with the correct calcium levels and its just is not worth it. As time passes on and your corals consume the calcium will go down. I would be more concerned with your reactor acting up and see what is going on before you have bigger problems.