Calcium Reactors ???
I see quite a few reefers talking about calcium reactors. I am unsure as to why I need one ... i realize that we need calcium for our tank to survive ... but is that not why we use additives ? what exactly does the calcium reactor do for us ? do we still need to add to our tank if we use one ? what are the pros and cons of using the calcium reactor ?
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Starting fresh ... 90 gal, 40gal sump, sundial T5HO x 4, 2 x koralia 2's, ASM G1X skimmer 
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