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- Feb 9, 2018
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I have been running rowaphos in my tank for the phosphates. Put it in on May 28th. I'm not sure how to tell when to replace it.I would focus on lowering phosphates still and increasing your magnesium to 1300-1400 after you can confirm numbers.
Phosphate might be the cause of your algae issues.
Have you ever tested you new saltwater for magnesium? With a 50% water change I’d except it to be at least 1000.
Also how do your corals look? My hammer was losing color and flesh when my magnesium was at 1100 Raised to 1350 and instantly better color and growing again.