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I recently dosed .25ml of vinegar 2 days in a new 50G system as an effort to normalize elevated Alk ad Ca in a new tank and see what effect it would have on PO4 at .5 ppm while I waited for my rowaphos, ozoneator, refugium substrate to arrive. Although I found the desired parameter change, I also found a huge cyanobacteria outbreak. I think all these elevated levels came as a result of hyper wet skimming and readjusting salinity with water changes. At this point the rowaphos will be online in a day or so but I'm also looking for a chloride based additive that won't effect Ca, Alk, of Mg.
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