Never had to supplement until I switched over to the larger grade calcium reactor media (Schuran) and was using IO (low Mg levels). Now I'm using zeomag in my reactor, works like a charm and keeps my levels at about 1290ppm.
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Christy's Reef Blog
My 180 Build
Every electronic component is shipped with smoke stored deep inside.... only a real genius can find a way to set it free.
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