siskiou Posted June 5, 2009 Share Posted June 5, 2009 Lately, I can't seem to keep my Alk up. It always drops down to 6-7 within a day, unless I dose hugely with Randy's recipe. My top-off water has Kalk, but that doesn't seem to be enough. I use Reef Crystals, and have for about a year and a half, my pH has actually been high lately (8.3-8.57), Calcium is at 420, MAG at 1300. I was blaming my sulfur denitrator, but I'm only running that on the 120G and the 60G has the same Alk problem. I've been running a phosban reactor with GFO on the 120G and have recently added a HOB with GFO to the 60G. Is that known to deplete ALK? Or how about Carbon? Does that lower Alk? I just can't believe that my little SPS frags would use it up that quickly! Quote Link to comment Share on other sites More sharing options...
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