I am using pre-bottled RO water from a company called Arrowhead that is less than 5 ppm per bottle. I dont think the water is the cause of this. I would try a phosban reactor, but I dont think I have room in my tank for another ugly pump. I have an aquaclear 500 converted into a hang ob back refugium, and I run a bag of rowaphos, a phosphate sponge, and a bag of de-nitrate in there along with my macroalgae and live rock rubble.
I am almost ready to give up on saltwater.
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